diff --git a/dist/datamodel/node/data/StructNode.d.ts b/dist/datamodel/node/data/StructNode.d.ts
index 1d797ee..68066b3 100644
--- a/dist/datamodel/node/data/StructNode.d.ts
+++ b/dist/datamodel/node/data/StructNode.d.ts
@@ -4,6 +4,7 @@ import type { PropClass, PIGroupDef } from '../BaseNode.js';
 import type { ChildAddEdit, ChildUndoRedo } from '../childEdit.js';
 export default class StructNode extends DataNode {
     _isElementNode?: boolean;
+    _fieldsDeclared: boolean;
     get icon(): string;
     get className(): string;
     get dataType(): string;
diff --git a/dist/datamodel/node/data/StructNode.d.ts.map b/dist/datamodel/node/data/StructNode.d.ts.map
index 2d4b132..25b0aa4 100644
--- a/dist/datamodel/node/data/StructNode.d.ts.map
+++ b/dist/datamodel/node/data/StructNode.d.ts.map
@@ -1 +1 @@
-{"version":3,"file":"StructNode.d.ts","sourceRoot":"","sources":["../../../../src/datamodel/node/data/StructNode.ts"],"names":[],"mappings":"AAEA,OAAO,QAAQ,MAAM,gBAAgB,CAAC;AAEtC,OAAO,KAAK,QAAQ,MAAM,gBAAgB,CAAC;AAC3C,OAAO,KAAK,EAAE,SAAS,EAAE,UAAU,EAAE,MAAM,gBAAgB,CAAC;AAE5D,OAAO,KAAK,EAAE,YAAY,EAAE,aAAa,EAAE,MAAM,iBAAiB,CAAC;AAUnE,MAAM,CAAC,OAAO,OAAO,UAAW,SAAQ,QAAQ;IAC5C,cAAc,CAAC,EAAE,OAAO,CAAC;IAEzB,IAAI,IAAI,IAAI,MAAM,CAEjB;IAED,IAAI,SAAS,IAAI,MAAM,CAEtB;IAGD,IAAI,QAAQ,IAAI,MAAM,CAErB;IAGD,IAAI,IAAI,IAAI,MAAM,CAEjB;IAED,IAAI,YAAY,IAAI,MAAM,CAEzB;IAUD,IAAI,IAAI,IAAI,MAAM,EAAE,CAEnB;IAOD,IAAI,YAAY,IAAI,MAAM,CAEzB;IAKD,IAAI,eAAe,IAAI,OAAO,CAE7B;IAID,IAAI,mBAAmB,IAAI,OAAO,CAEjC;IAED,aAAa,IAAI,SAAS,EAAE;IAI5B,WAAW,IAAI,UAAU,EAAE;IAQ3B,gBAAgB,IAAI,MAAM,CAAC,MAAM,EAAE,OAAO,CAAC;IAU3C,cAAc,IAAI,OAAO;IAgCzB,YAAY,CAAC,OAAO,EAAE,MAAM,EAAE,KAAK,EAAE,MAAM,CAAC,MAAM,EAAE,MAAM,CAAC,GAAG,SAAS,EAAE,MAAM,EAAE,MAAM,GAAG,MAAM;IA8ChG,YAAY,CAAC,IAAI,EAAE,MAAM,EAAE,EAAE,EAAE,MAAM,GAAG,IAAI;IAkB5C,cAAc,IAAI,OAAO;IAIzB,eAAe,CAAC,KAAK,EAAE,QAAQ,GAAG,IAAI;IActC,gBAAgB,CAAC,KAAK,EAAE,QAAQ,EAAE,KAAK,EAAE,MAAM,GAAG,IAAI;IAStD,WAAW,IAAI,OAAO;IAItB,YAAY,IAAI,QAAQ;IAmBxB,YAAY,IAAI,YAAY,CAAC,QAAQ,CAAC,GAAG,IAAI;IAC7C,eAAe,CAAC,KAAK,CAAC,EAAE,QAAQ,GAAG,aAAa,GAAG,IAAI;IAEvD,MAAM,CAAC,KAAK,CAAC,MAAM,EAAE,MAAM,CAAC,MAAM,EAAE,OAAO,CAAC,EAAE,IAAI,EAAE,MAAM,EAAE,MAAM,EAAE,QAAQ,GAAG,IAAI,GAAG,UAAU;IAyChG,MAAM,KAAK,WAAW,IAAI,MAAM,CAAqB;IAErD,MAAM,CAAC,aAAa,CAAC,IAAI,EAAE,MAAM,EAAE,MAAM,EAAE,QAAQ,GAAG,IAAI,GAAG,UAAU;CAU1E"}
\ No newline at end of file
+{"version":3,"file":"StructNode.d.ts","sourceRoot":"","sources":["../../../../src/datamodel/node/data/StructNode.ts"],"names":[],"mappings":"AAEA,OAAO,QAAQ,MAAM,gBAAgB,CAAC;AAEtC,OAAO,KAAK,QAAQ,MAAM,gBAAgB,CAAC;AAC3C,OAAO,KAAK,EAAE,SAAS,EAAE,UAAU,EAAE,MAAM,gBAAgB,CAAC;AAE5D,OAAO,KAAK,EAAE,YAAY,EAAE,aAAa,EAAE,MAAM,iBAAiB,CAAC;AAuCnE,MAAM,CAAC,OAAO,OAAO,UAAW,SAAQ,QAAQ;IAC5C,cAAc,CAAC,EAAE,OAAO,CAAC;IASzB,eAAe,UAAS;IAExB,IAAI,IAAI,IAAI,MAAM,CAEjB;IAED,IAAI,SAAS,IAAI,MAAM,CAEtB;IAGD,IAAI,QAAQ,IAAI,MAAM,CAErB;IAGD,IAAI,IAAI,IAAI,MAAM,CAEjB;IAED,IAAI,YAAY,IAAI,MAAM,CAEzB;IAUD,IAAI,IAAI,IAAI,MAAM,EAAE,CAEnB;IAOD,IAAI,YAAY,IAAI,MAAM,CAEzB;IAKD,IAAI,eAAe,IAAI,OAAO,CAE7B;IAID,IAAI,mBAAmB,IAAI,OAAO,CAEjC;IAED,aAAa,IAAI,SAAS,EAAE;IAI5B,WAAW,IAAI,UAAU,EAAE;IAQ3B,gBAAgB,IAAI,MAAM,CAAC,MAAM,EAAE,OAAO,CAAC;IAU3C,cAAc,IAAI,OAAO;IAgCzB,YAAY,CAAC,OAAO,EAAE,MAAM,EAAE,KAAK,EAAE,MAAM,CAAC,MAAM,EAAE,MAAM,CAAC,GAAG,SAAS,EAAE,MAAM,EAAE,MAAM,GAAG,MAAM;IA8ChG,YAAY,CAAC,IAAI,EAAE,MAAM,EAAE,EAAE,EAAE,MAAM,GAAG,IAAI;IAkB5C,cAAc,IAAI,OAAO;IAIzB,eAAe,CAAC,KAAK,EAAE,QAAQ,GAAG,IAAI;IActC,gBAAgB,CAAC,KAAK,EAAE,QAAQ,EAAE,KAAK,EAAE,MAAM,GAAG,IAAI;IAStD,WAAW,IAAI,OAAO;IAItB,YAAY,IAAI,QAAQ;IAmBxB,YAAY,IAAI,YAAY,CAAC,QAAQ,CAAC,GAAG,IAAI;IAC7C,eAAe,CAAC,KAAK,CAAC,EAAE,QAAQ,GAAG,aAAa,GAAG,IAAI;IAEvD,MAAM,CAAC,KAAK,CAAC,MAAM,EAAE,MAAM,CAAC,MAAM,EAAE,OAAO,CAAC,EAAE,IAAI,EAAE,MAAM,EAAE,MAAM,EAAE,QAAQ,GAAG,IAAI,GAAG,UAAU;IAkDhG,MAAM,KAAK,WAAW,IAAI,MAAM,CAAqB;IAErD,MAAM,CAAC,aAAa,CAAC,IAAI,EAAE,MAAM,EAAE,MAAM,EAAE,QAAQ,GAAG,IAAI,GAAG,UAAU;CAe1E"}
\ No newline at end of file
diff --git a/dist/datamodel/node/data/StructNode.js b/dist/datamodel/node/data/StructNode.js
index b449b02..c563f92 100644
--- a/dist/datamodel/node/data/StructNode.js
+++ b/dist/datamodel/node/data/StructNode.js
@@ -10,7 +10,46 @@ import PropKind from '../../prop/PropKind.js';
 import PropClassAtom from '../../prop/PropClass.js';
 import { escapeXml, pad as xmlPad } from '../../parser/XmlUtils.js';
 import { effectiveDims, elementCount, summaryForm } from '../../display/DisplayConvention.js';
+/**
+ * A struct's field names, read from the bytes rather than trusted from a key MATLAB may
+ * not have written.
+ *
+ * `_fields` wins when it is there, because it is the only statement of field ORDER an
+ * envelope carries and a bag's order is otherwise just a JSON object's key order. Absent
+ * it, the names ARE the keys of the element bag — which is what `BinarySlddParser`
+ * (`_fields: Object.keys(parsed[0])`), `McosParser` and `MatlabVariableNode` have all
+ * derived for themselves all along. That is why those three channels were unaffected when
+ * MATLAB stopped writing `_fields` into a text dictionary between builds `27.1.0.3353139`
+ * and `27.1.0.3393633`, and the text channel — the one that passed MATLAB's JSON straight
+ * through and trusted the key — showed every struct with no field rows at all.
+ *
+ * Element 0 rather than a union across elements, deliberately: a struct ARRAY shares one
+ * field list by definition, which is what makes it an array and not a bag of unrelated
+ * structs (see `_renameField`), so element 0 states it. It is also the rule the binary
+ * parser already applies, and a union would be a second rule for the same question.
+ */
+function fieldsOf(rawVal) {
+    if (Array.isArray(rawVal._fields)) {
+        return rawVal._fields;
+    }
+    const elements = rawVal._elements;
+    if (Array.isArray(elements) && elements.length > 0 && elements[0]) {
+        return Object.keys(elements[0]);
+    }
+    return [];
+}
 export default class StructNode extends DataNode {
+    constructor() {
+        super(...arguments);
+        // Whether the parsed envelope DECLARED `_fields`, as opposed to us deriving the list
+        // from its element bag. Only `serializeValue` asks, and only so that a save does not
+        // add the key back to a file MATLAB left it out of: the reader may not depend on
+        // `_fields`, so the writer may not start producing it either, or our saves would
+        // diverge from MATLAB's own for every struct in every current-build dictionary. An
+        // untouched node replays `_rawInput` and never reaches the question; a modified one
+        // has already lost those bytes, which is why this is stored rather than re-read.
+        this._fieldsDeclared = false;
+    }
     get icon() {
         return 'wsTree';
     }
@@ -100,7 +139,7 @@ export default class StructNode extends DataNode {
             _dimensions: d,
             _elements: elements
         };
-        if (this.serial._fields) {
+        if (this._fieldsDeclared) {
             result._fields = fields;
         }
         result._mw_element_type = this.serial._mw_element_type || 'MATLABArray';
@@ -219,14 +258,19 @@ export default class StructNode extends DataNode {
     execAddChild() { return addChildUndoable(this); }
     execRemoveChild(child) { return removeChildUndoable(this, child); }
     static parse(rawVal, name, parent) {
+        // Always an ARRAY, derived if MATLAB did not declare one, so that everything
+        // downstream of here — serializeElement, add/remove/restore, _renameField — reads
+        // one list that is already right rather than re-deciding the question. `fieldsOf`
+        // is the single place that decision is made.
+        const fields = fieldsOf(rawVal);
         const serial = {
             _dimensions: rawVal._dimensions,
-            _fields: rawVal._fields,
+            _fields: fields,
             _mw_element_type: rawVal._mw_element_type
         };
         const node = new StructNode(name, parent, serial);
         node._rawInput = rawVal;
-        const fields = rawVal._fields || [];
+        node._fieldsDeclared = Array.isArray(rawVal._fields);
         const elements = rawVal._elements || [];
         if (elements.length > 1) {
             const dims = rawVal._dimensions || [1, elements.length];
@@ -238,6 +282,10 @@ export default class StructNode extends DataNode {
                 };
                 const elemNode = new StructNode(String(ei), node, elemSerial);
                 elemNode._isElementNode = true;
+                // Same answer as the array root's, so the two cannot come to disagree about
+                // it. An element serializes through serializeElement and so never emits
+                // `_fields` itself; this is here to keep that true by construction.
+                elemNode._fieldsDeclared = node._fieldsDeclared;
                 // Column-major, as MATLAB stores it — see ObjectNode. The label is
                 // DERIVED from this spec by BaseNode.displayName rather than baked
                 // here, so renaming the array relabels its elements.
@@ -264,6 +312,11 @@ export default class StructNode extends DataNode {
             _dimensions: [1, 1],
             _num_fields: 0,
             _field_names: [],
+            // Declared, empty. A struct WE invent has no MATLAB bytes to stay faithful to,
+            // so it keeps writing `_fields` the way it did before the list became
+            // derivable — the emit policy only exists to avoid contradicting a file MATLAB
+            // wrote, and there is no such file here.
+            _fields: [],
             _elements: [{}]
         };
         return StructNode.parse(rawVal, name, parent);
diff --git a/dist/datamodel/node/data/StructNode.js.map b/dist/datamodel/node/data/StructNode.js.map
index 0426f71..0207173 100644
--- a/dist/datamodel/node/data/StructNode.js.map
+++ b/dist/datamodel/node/data/StructNode.js.map
@@ -1 +1 @@
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\ No newline at end of file
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\ No newline at end of file
diff --git a/dist/datamodel/parser/BinarySlddParser.js b/dist/datamodel/parser/BinarySlddParser.js
index 18da1b6..ed60e31 100644
--- a/dist/datamodel/parser/BinarySlddParser.js
+++ b/dist/datamodel/parser/BinarySlddParser.js
@@ -425,7 +425,7 @@ function parseEntryValue(prop) {
     }
     // Numeric scalar or array
     const text = getTextContent(prop);
-    if (prop['@_IsComplex'] === '1') {
+    if (isComplexAttr(prop['@_IsComplex'])) {
         const result = { _type: 'cdata', _value: text };
         if (dimension) {
             result._dimensions = parseDims(dimension);
@@ -474,7 +474,7 @@ function parseCellElement(el) {
         // this check by falling past the shaped arm; that is the only reason the defect
         // hid. `_dimensions` rides in the envelope because the cdata form is the only
         // place a complex value's shape can be stated.
-        if (el['@_IsComplex'] === '1') {
+        if (isComplexAttr(el['@_IsComplex'])) {
             const cdata = { _type: 'cdata', _value: text };
             if (dimension) {
                 cdata._dimensions = parseDims(dimension);
@@ -790,7 +790,7 @@ function parseStructElement(el) {
         }
         // A complex scalar carries its value as text with IsComplex="1" rather than
         // as child elements, so it never reaches the generic content decoder.
-        if (!prop.Element?.length && prop['@_IsComplex'] === '1') {
+        if (!prop.Element?.length && isComplexAttr(prop['@_IsComplex'])) {
             const dimension = prop['@_Dimension'] || null;
             const cdata = { _type: 'cdata', _value: getTextContent(prop) };
             if (dimension) {
@@ -835,21 +835,10 @@ function parseTypedValue(text, className, dimension) {
     }
     switch (className) {
         case 'double':
+            // Its own arm because its answer differs: a double's stored spelling IS a double's,
+            // so it needs no per-class narrowing. Every OTHER numeric class falls to the default
+            // and is recognized there, by the same predicate the shaped arm above used.
             return parseMatlabNum(text);
-        case 'single':
-        case 'int32':
-        case 'uint32':
-        case 'int16':
-        case 'uint16':
-        case 'int8':
-        case 'uint8':
-        // int64/uint64 belong here and not in the `default` arm: the default returns the
-        // bare body text, which the writer can only spell `Class="char"`. The value itself
-        // survived — a 64-bit scalar's stored text IS its exact decimal — so this half of
-        // defect 27 lost the CLASS rather than the digits.
-        case 'int64':
-        case 'uint64':
-            return formatTypedScalar(text, className);
         case 'logical':
             return text === '1' || text === 'true';
         case 'char':
@@ -858,27 +847,53 @@ function parseTypedValue(text, className, dimension) {
             // shape too, and the numeric branch above never claimed it.
             return charValue(text, dimension);
         default:
+            // Asked as a CLASS, not enumerated. This used to be nine more `case` labels, a
+            // second copy of isNumericClass's list — and the bug that copy invites is exactly
+            // defect 27: int64/uint64 were missing from BOTH lists, the value fell through to
+            // the bare-text return below, and the writer, seeing a bare string, spelled it
+            // `Class="char"`. One list, asked in every place the question comes up, is the only
+            // arrangement in which that cannot happen a second time.
+            if (isNumericClass(className)) {
+                return formatTypedScalar(text, className);
+            }
             return text || '';
     }
 }
-// int64 and uint64 were missing from this list AND from parseCellElement's copy of it,
-// which is what made a 64-bit struct FIELD come back as text: parseTypedValue fell
-// through the numeric branch to the `default: return text`, so sTyped's uint64 [7 8]
-// decoded as the string '7 8' and the writer, seeing a bare string, wrote
-// `<P Name="d" Class="char">7 8</P>` — MATLAB reopened the field as a 1x3 char (defect
+// The integer family is matched as a FAMILY rather than listed member by member, because
+// the listing is what failed: int64 and uint64 were missing from this list AND from
+// parseCellElement's copy of it, which is what made a 64-bit struct FIELD come back as
+// text — parseTypedValue fell through the numeric branch to `default: return text`, so
+// sTyped's uint64 [7 8] decoded as the string '7 8' and the writer, seeing a bare string,
+// wrote `<P Name="d" Class="char">7 8</P>`, which MATLAB reopened as a 1x3 char (defect
 // 27). The entry-level path never had the gap, so the same value was right at the top
-// level and wrong one level down.
+// level and wrong one level down. A pattern cannot omit a width.
+//
+// Deliberately NOT a catch-all "unknown class, probably numeric", and `half` is
+// deliberately not in it. The arms this gates parse the body as numbers and the save path
+// then formats from the `_type`, so admitting a class those two do not both understand
+// turns a wrong TYPE into wrong DIGITS. Measured: `Class="half">1.5` admitted this way
+// writes back `2`, and a class whose body is not numeric at all writes back `0`. Losing
+// the class and keeping the characters — what the `default` arm does — is the less
+// destructive of the two failures, so an unrecognized class stays there on purpose. Adding
+// `half` needs the float handling on the save side too, not just a name here.
+const NUMERIC_CLASS = /^(?:double|single|u?int(?:8|16|32|64))$/;
 function isNumericClass(className) {
-    return (className === 'double' ||
-        className === 'single' ||
-        className === 'int32' ||
-        className === 'uint32' ||
-        className === 'int16' ||
-        className === 'uint16' ||
-        className === 'int8' ||
-        className === 'uint8' ||
-        className === 'int64' ||
-        className === 'uint64');
+    return NUMERIC_CLASS.test(className);
+}
+// `IsComplex="1"` is the only spelling MATLAB has been measured writing, and the only one
+// we write. `"true"` is accepted as well — the same latitude parseTypedValue's `logical`
+// arm already takes (`text === '1' || text === 'true'`), and taken here for the reason
+// that arm is not controversial: the cost of not recognizing the attribute is asymmetric.
+// It does not merely degrade the display; the imaginary parts leave the value AND the next
+// save, because a re-serialized element that was not read as complex is not written as
+// complex either. That was defect 53's whole shape. Reading one extra spelling costs
+// nothing today and turns a possible format change from silent data loss into a no-op.
+//
+// Three call sites — an entry value, a cell element and a property — which is why this is
+// a function and not three comparisons: "one rule, three paths, two of them right" is how
+// 52 and 53 both happened.
+function isComplexAttr(attr) {
+    return attr === '1' || attr === 'true';
 }
 // One numeric body, as the CLASS requires: exact decimal text for the tokens a 64-bit
 // integer cannot round-trip through a double, plain numbers for everything else. The
diff --git a/dist/datamodel/parser/BinarySlddParser.js.map b/dist/datamodel/parser/BinarySlddParser.js.map
index becbbc3..b9ec717 100644
--- a/dist/datamodel/parser/BinarySlddParser.js.map
+++ b/dist/datamodel/parser/BinarySlddParser.js.map
@@ -1 +1 @@
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\ No newline at end of file
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\ No newline at end of file
diff --git a/src/datamodel/node/data/StructNode.ts b/src/datamodel/node/data/StructNode.ts
index e8a30a9..f824e24 100644
--- a/src/datamodel/node/data/StructNode.ts
+++ b/src/datamodel/node/data/StructNode.ts
@@ -15,9 +15,47 @@ import PropClassAtom from '../../prop/PropClass.js';
 import { escapeXml, pad as xmlPad } from '../../parser/XmlUtils.js';
 import { effectiveDims, elementCount, summaryForm } from '../../display/DisplayConvention.js';
 
+/**
+ * A struct's field names, read from the bytes rather than trusted from a key MATLAB may
+ * not have written.
+ *
+ * `_fields` wins when it is there, because it is the only statement of field ORDER an
+ * envelope carries and a bag's order is otherwise just a JSON object's key order. Absent
+ * it, the names ARE the keys of the element bag — which is what `BinarySlddParser`
+ * (`_fields: Object.keys(parsed[0])`), `McosParser` and `MatlabVariableNode` have all
+ * derived for themselves all along. That is why those three channels were unaffected when
+ * MATLAB stopped writing `_fields` into a text dictionary between builds `27.1.0.3353139`
+ * and `27.1.0.3393633`, and the text channel — the one that passed MATLAB's JSON straight
+ * through and trusted the key — showed every struct with no field rows at all.
+ *
+ * Element 0 rather than a union across elements, deliberately: a struct ARRAY shares one
+ * field list by definition, which is what makes it an array and not a bag of unrelated
+ * structs (see `_renameField`), so element 0 states it. It is also the rule the binary
+ * parser already applies, and a union would be a second rule for the same question.
+ */
+function fieldsOf(rawVal: Record<string, unknown>): string[] {
+    if (Array.isArray(rawVal._fields)) {
+        return rawVal._fields as string[];
+    }
+    const elements = rawVal._elements as Record<string, unknown>[] | undefined;
+    if (Array.isArray(elements) && elements.length > 0 && elements[0]) {
+        return Object.keys(elements[0]);
+    }
+    return [];
+}
+
 export default class StructNode extends DataNode {
     _isElementNode?: boolean;
 
+    // Whether the parsed envelope DECLARED `_fields`, as opposed to us deriving the list
+    // from its element bag. Only `serializeValue` asks, and only so that a save does not
+    // add the key back to a file MATLAB left it out of: the reader may not depend on
+    // `_fields`, so the writer may not start producing it either, or our saves would
+    // diverge from MATLAB's own for every struct in every current-build dictionary. An
+    // untouched node replays `_rawInput` and never reaches the question; a modified one
+    // has already lost those bytes, which is why this is stored rather than re-read.
+    _fieldsDeclared = false;
+
     get icon(): string {
         return 'wsTree';
     }
@@ -121,7 +159,7 @@ export default class StructNode extends DataNode {
             _dimensions: d,
             _elements: elements
         };
-        if (this.serial._fields) {
+        if (this._fieldsDeclared) {
             result._fields = fields;
         }
         result._mw_element_type = (this.serial._mw_element_type as string) || 'MATLABArray';
@@ -246,14 +284,19 @@ export default class StructNode extends DataNode {
     execRemoveChild(child?: BaseNode): ChildUndoRedo | null { return removeChildUndoable(this, child); }
 
     static parse(rawVal: Record<string, unknown>, name: string, parent: BaseNode | null): StructNode {
+        // Always an ARRAY, derived if MATLAB did not declare one, so that everything
+        // downstream of here — serializeElement, add/remove/restore, _renameField — reads
+        // one list that is already right rather than re-deciding the question. `fieldsOf`
+        // is the single place that decision is made.
+        const fields = fieldsOf(rawVal);
         const serial: Record<string, unknown> = {
             _dimensions: rawVal._dimensions,
-            _fields: rawVal._fields,
+            _fields: fields,
             _mw_element_type: rawVal._mw_element_type
         };
         const node = new StructNode(name, parent, serial);
         node._rawInput = rawVal;
-        const fields = (rawVal._fields as string[]) || [];
+        node._fieldsDeclared = Array.isArray(rawVal._fields);
         const elements = (rawVal._elements as Record<string, unknown>[]) || [];
 
         if (elements.length > 1) {
@@ -266,6 +309,10 @@ export default class StructNode extends DataNode {
                 };
                 const elemNode = new StructNode(String(ei), node, elemSerial);
                 elemNode._isElementNode = true;
+                // Same answer as the array root's, so the two cannot come to disagree about
+                // it. An element serializes through serializeElement and so never emits
+                // `_fields` itself; this is here to keep that true by construction.
+                elemNode._fieldsDeclared = node._fieldsDeclared;
                 // Column-major, as MATLAB stores it — see ObjectNode. The label is
                 // DERIVED from this spec by BaseNode.displayName rather than baked
                 // here, so renaming the array relabels its elements.
@@ -294,6 +341,11 @@ export default class StructNode extends DataNode {
             _dimensions: [1, 1],
             _num_fields: 0,
             _field_names: [],
+            // Declared, empty. A struct WE invent has no MATLAB bytes to stay faithful to,
+            // so it keeps writing `_fields` the way it did before the list became
+            // derivable — the emit policy only exists to avoid contradicting a file MATLAB
+            // wrote, and there is no such file here.
+            _fields: [],
             _elements: [{}]
         };
         return StructNode.parse(rawVal, name, parent);
diff --git a/src/datamodel/parser/BinarySlddParser.ts b/src/datamodel/parser/BinarySlddParser.ts
index ac96ce8..8921175 100644
--- a/src/datamodel/parser/BinarySlddParser.ts
+++ b/src/datamodel/parser/BinarySlddParser.ts
@@ -497,7 +497,7 @@ function parseEntryValue(prop: XmlNode): unknown {
 
   // Numeric scalar or array
   const text = getTextContent(prop);
-  if (prop['@_IsComplex'] === '1') {
+  if (isComplexAttr(prop['@_IsComplex'])) {
     const result: Record<string, unknown> = { _type: 'cdata', _value: text };
     if (dimension) {
       result._dimensions = parseDims(dimension);
@@ -549,7 +549,7 @@ function parseCellElement(el: XmlNode): unknown {
     // this check by falling past the shaped arm; that is the only reason the defect
     // hid. `_dimensions` rides in the envelope because the cdata form is the only
     // place a complex value's shape can be stated.
-    if (el['@_IsComplex'] === '1') {
+    if (isComplexAttr(el['@_IsComplex'])) {
       const cdata: Record<string, unknown> = { _type: 'cdata', _value: text };
       if (dimension) {
         cdata._dimensions = parseDims(dimension);
@@ -875,7 +875,7 @@ function parseStructElement(el: XmlNode): Record<string, unknown> {
     }
     // A complex scalar carries its value as text with IsComplex="1" rather than
     // as child elements, so it never reaches the generic content decoder.
-    if (!prop.Element?.length && prop['@_IsComplex'] === '1') {
+    if (!prop.Element?.length && isComplexAttr(prop['@_IsComplex'])) {
       const dimension = prop['@_Dimension'] || null;
       const cdata: Record<string, unknown> = { _type: 'cdata', _value: getTextContent(prop) };
       if (dimension) {
@@ -929,21 +929,10 @@ function parseTypedValue(text: string, className: string | null, dimension: stri
 
   switch (className) {
     case 'double':
+      // Its own arm because its answer differs: a double's stored spelling IS a double's,
+      // so it needs no per-class narrowing. Every OTHER numeric class falls to the default
+      // and is recognized there, by the same predicate the shaped arm above used.
       return parseMatlabNum(text);
-    case 'single':
-    case 'int32':
-    case 'uint32':
-    case 'int16':
-    case 'uint16':
-    case 'int8':
-    case 'uint8':
-    // int64/uint64 belong here and not in the `default` arm: the default returns the
-    // bare body text, which the writer can only spell `Class="char"`. The value itself
-    // survived — a 64-bit scalar's stored text IS its exact decimal — so this half of
-    // defect 27 lost the CLASS rather than the digits.
-    case 'int64':
-    case 'uint64':
-      return formatTypedScalar(text, className);
     case 'logical':
       return text === '1' || text === 'true';
     case 'char':
@@ -952,30 +941,56 @@ function parseTypedValue(text: string, className: string | null, dimension: stri
       // shape too, and the numeric branch above never claimed it.
       return charValue(text, dimension);
     default:
+      // Asked as a CLASS, not enumerated. This used to be nine more `case` labels, a
+      // second copy of isNumericClass's list — and the bug that copy invites is exactly
+      // defect 27: int64/uint64 were missing from BOTH lists, the value fell through to
+      // the bare-text return below, and the writer, seeing a bare string, spelled it
+      // `Class="char"`. One list, asked in every place the question comes up, is the only
+      // arrangement in which that cannot happen a second time.
+      if (isNumericClass(className)) {
+        return formatTypedScalar(text, className);
+      }
       return text || '';
   }
 }
 
-// int64 and uint64 were missing from this list AND from parseCellElement's copy of it,
-// which is what made a 64-bit struct FIELD come back as text: parseTypedValue fell
-// through the numeric branch to the `default: return text`, so sTyped's uint64 [7 8]
-// decoded as the string '7 8' and the writer, seeing a bare string, wrote
-// `<P Name="d" Class="char">7 8</P>` — MATLAB reopened the field as a 1x3 char (defect
+// The integer family is matched as a FAMILY rather than listed member by member, because
+// the listing is what failed: int64 and uint64 were missing from this list AND from
+// parseCellElement's copy of it, which is what made a 64-bit struct FIELD come back as
+// text — parseTypedValue fell through the numeric branch to `default: return text`, so
+// sTyped's uint64 [7 8] decoded as the string '7 8' and the writer, seeing a bare string,
+// wrote `<P Name="d" Class="char">7 8</P>`, which MATLAB reopened as a 1x3 char (defect
 // 27). The entry-level path never had the gap, so the same value was right at the top
-// level and wrong one level down.
+// level and wrong one level down. A pattern cannot omit a width.
+//
+// Deliberately NOT a catch-all "unknown class, probably numeric", and `half` is
+// deliberately not in it. The arms this gates parse the body as numbers and the save path
+// then formats from the `_type`, so admitting a class those two do not both understand
+// turns a wrong TYPE into wrong DIGITS. Measured: `Class="half">1.5` admitted this way
+// writes back `2`, and a class whose body is not numeric at all writes back `0`. Losing
+// the class and keeping the characters — what the `default` arm does — is the less
+// destructive of the two failures, so an unrecognized class stays there on purpose. Adding
+// `half` needs the float handling on the save side too, not just a name here.
+const NUMERIC_CLASS = /^(?:double|single|u?int(?:8|16|32|64))$/;
+
 function isNumericClass(className: string): boolean {
-  return (
-    className === 'double' ||
-    className === 'single' ||
-    className === 'int32' ||
-    className === 'uint32' ||
-    className === 'int16' ||
-    className === 'uint16' ||
-    className === 'int8' ||
-    className === 'uint8' ||
-    className === 'int64' ||
-    className === 'uint64'
-  );
+  return NUMERIC_CLASS.test(className);
+}
+
+// `IsComplex="1"` is the only spelling MATLAB has been measured writing, and the only one
+// we write. `"true"` is accepted as well — the same latitude parseTypedValue's `logical`
+// arm already takes (`text === '1' || text === 'true'`), and taken here for the reason
+// that arm is not controversial: the cost of not recognizing the attribute is asymmetric.
+// It does not merely degrade the display; the imaginary parts leave the value AND the next
+// save, because a re-serialized element that was not read as complex is not written as
+// complex either. That was defect 53's whole shape. Reading one extra spelling costs
+// nothing today and turns a possible format change from silent data loss into a no-op.
+//
+// Three call sites — an entry value, a cell element and a property — which is why this is
+// a function and not three comparisons: "one rule, three paths, two of them right" is how
+// 52 and 53 both happened.
+function isComplexAttr(attr: string | undefined): boolean {
+  return attr === '1' || attr === 'true';
 }
 
 // One numeric body, as the CLASS requires: exact decimal text for the tokens a 64-bit
diff --git a/test/binarySlddValues.test.ts b/test/binarySlddValues.test.ts
index 418f739..8fcc023 100644
--- a/test/binarySlddValues.test.ts
+++ b/test/binarySlddValues.test.ts
@@ -598,3 +598,87 @@ describe('parseBinarySlddParts — document-level bookkeeping', () => {
     expect(() => parseBinarySldd(ab)).toThrow('Missing data/chunk0.xml in binary SLDD');
   });
 });
+
+// A `Class`/`IsComplex` attribute is read as a KIND of thing, not matched against a
+// transcript of what one build of MATLAB happened to write. Both rules below were closed
+// enumerations, and each enumeration has a defect on record:
+//
+//   - `isNumericClass` listed its ten class names by hand, and `parseTypedValue` listed
+//     nine of them AGAIN as `case` labels. int64/uint64 were missing from both, so a
+//     64-bit struct FIELD fell through to the bare-text return and the writer, seeing a
+//     bare string, spelled it `Class="char"` — MATLAB reopened the field as a char row of
+//     digits (defect 27). The integer family is now one pattern asked in one place, so it
+//     cannot omit a width and the two sites cannot disagree about one.
+//   - `IsComplex` was compared to the literal `'1'` in three places. A spelling this
+//     reader fails to recognize does not merely mis-display: the value loses its imaginary
+//     parts AND is re-serialized without `IsComplex`, so they leave the file too — defect
+//     53's exact shape. `'true'` is accepted as well now, the same latitude the `logical`
+//     arm has always taken.
+describe('parseBinarySlddParts — class and complexity read as kinds, not spellings', () => {
+  // Every integer width MATLAB has, crossed with all three sites the format nests a typed
+  // value at: an entry's own value, a struct FIELD, and a cell ELEMENT. The crossing is the
+  // point — defect 27 was right at the entry site and wrong at the other two, so a table
+  // that checked one site would have passed throughout.
+  const INT_CLASSES = ['int8', 'uint8', 'int16', 'uint16', 'int32', 'uint32', 'int64', 'uint64'];
+
+  for (const cls of INT_CLASSES) {
+    it(`keeps the class of a ${cls} at the entry, field and cell sites`, () => {
+      // The CLASS is the assertion, not the serial spelling of the digits: an unsigned
+      // value carries a `U` suffix and a 64-bit one is held as exact text, both of which
+      // are pinned elsewhere. What defect 27 destroyed was the class.
+      const entry = value(`<P Name="Value" Class="${cls}">7</P>`);
+      expect(entry, 'entry value').toMatchObject({ _type: cls });
+      // And the save half, which is how 27 reached the file rather than only the screen:
+      // a value whose class the reader dropped comes back out as Class="char".
+      expect(saved(entry), 'entry value writes its class').toContain(`Class="${cls}"`);
+
+      const field = value(
+        `<P Name="Value" Class="struct"><Element><P Name="f" Class="${cls}">7</P></Element></P>`,
+      ) as Record<string, any>;
+      expect(field._elements[0].f, 'struct field').toMatchObject({ _type: cls });
+
+      const cell = value(
+        `<P Name="Value" Class="cell" Dimension="1*1"><Element Class="${cls}">7</Element></P>`,
+      ) as Record<string, any>;
+      expect(cell._elements[0], 'cell element').toMatchObject({ _type: cls });
+    });
+  }
+
+  it('leaves a class it does not know as text rather than guessing a number', () => {
+    // The pattern is deliberately not a catch-all, and this is the measurement that says
+    // so. Admitting an unknown class into the numeric arms hands the save path a `_type`
+    // it cannot format: `Class="half">1.5` comes back out as `2`, and a class whose body is
+    // not numeric at all comes back out as `0`. Dropping the class and keeping the
+    // characters is the less destructive failure, so it is the one this arm takes — which
+    // is also why `half`, a real MATLAB numeric class, is NOT in the pattern.
+    const field = value(
+      '<P Name="Value" Class="struct"><Element><P Name="f" Class="half">1.5</P></Element></P>',
+    ) as Record<string, any>;
+    expect(field._elements[0].f).toBe('1.5');
+  });
+
+  for (const spelling of ['1', 'true']) {
+    it(`reads IsComplex="${spelling}" as complex at the entry, field and cell sites`, () => {
+      const entry = value(`<P Name="Value" Class="double" IsComplex="${spelling}">1.0+2.0i</P>`);
+      expect(entry, 'entry value').toEqual({ _type: 'cdata', _value: '1.0+2.0i' });
+
+      const field = value(
+        `<P Name="Value" Class="struct"><Element>` +
+          `<P Name="f" Class="double" IsComplex="${spelling}">1.0+2.0i</P></Element></P>`,
+      ) as Record<string, any>;
+      expect(field._elements[0].f, 'struct field').toEqual({ _type: 'cdata', _value: '1.0+2.0i' });
+
+      // The cell element states its shape in the envelope, because the text form is the
+      // only place a complex value's shape can be stated at all (defect 53).
+      const cell = value(
+        `<P Name="Value" Class="cell" Dimension="1*1">` +
+          `<Element Class="double" IsComplex="${spelling}" Dimension="1*2">1.0+2.0i 3.0-4.0i</Element></P>`,
+      ) as Record<string, any>;
+      expect(cell._elements[0], 'cell element').toEqual({
+        _type: 'cdata',
+        _value: '1.0+2.0i 3.0-4.0i',
+        _dimensions: [1, 2],
+      });
+    });
+  }
+});
diff --git a/test/binaryWriteBackGate.test.ts b/test/binaryWriteBackGate.test.ts
index 8a3ecb5..558264c 100644
--- a/test/binaryWriteBackGate.test.ts
+++ b/test/binaryWriteBackGate.test.ts
@@ -471,21 +471,16 @@ describe('defect 52: a string in a cell keeps its text, in the file as well as o
       const n = findEntry(root, name);
       return [String(n.displayValue), ...n.children.map((c: any) => String(c.displayValue))];
     };
-    for (const [name] of [...CELLS, ['cObj']]) {
+    // sStr, the string-in-a-STRUCT case, is compared on its field too. It used to be
+    // compared on its entry row alone: the build that wrote these fixtures (27.1.0.3393633)
+    // stopped emitting `_fields` in a text dictionary and StructNode.parse built a scalar
+    // struct's field children from `_fields` alone, so the text channel showed this struct
+    // with no field row while the binary channel derived the list from the element bag. That
+    // was its own defect (56) and it is fixed — `fieldsOf` now derives in the one place all
+    // four channels funnel through — so there is nothing left here to carve out.
+    for (const [name] of [...CELLS, ['cObj'], ['sStr']]) {
       expect(shown(bin, name), name).toEqual(shown(txt, name));
     }
-    // sStr is compared on its own row alone, and deliberately not on its field. The channels
-    // DISAGREE there, for a reason that has nothing to do with strings or with cells: the
-    // build of MATLAB that wrote these two fixtures (27.1.0.3393633) no longer emits
-    // `_fields` in a text dictionary, and StructNode.parse builds a scalar struct's field
-    // children from `_fields` alone — so the text channel shows this struct with no field row
-    // at all, while the binary channel derives the list from the element bag
-    // (BinarySlddParser's `_fields: Object.keys(parsed[0])`). That is its own defect, with its
-    // own blast radius — every struct in every current-MATLAB text .sldd — and it is not
-    // asserted either way here.
-    expect(String(findEntry(bin, 'sStr').displayValue)).toBe(
-      String(findEntry(txt, 'sStr').displayValue),
-    );
   });
 
   it('writes every saveobj payload back, rather than an empty envelope', () => {
@@ -616,20 +611,15 @@ describe('defects 53-55: an array inside a cell keeps its shape, its parts and i
     const bin = loadFile('../fixtures/cellarr_binary.sldd', 'cellarr_binary.sldd');
     const txt = loadFile('../fixtures/cellarr_text.sldd', 'cellarr_text.sldd');
 
-    // The walk stops at a SCALAR struct, and nowhere else. That is the one place the two
-    // channels are known to disagree for a reason unrelated to cells: the build of MATLAB
-    // that wrote these fixtures no longer emits `_fields` in a text dictionary, and
-    // StructNode.parse builds a scalar struct's field children from `_fields` alone, so the
-    // text channel shows a scalar struct with no field rows while the binary channel
-    // derives the list from the element bag. Its own defect, its own blast radius (every
-    // struct in every current-MATLAB text .sldd), not asserted either way here.
+    // The walk stops nowhere. It used to stop at a SCALAR struct, which was the one place
+    // the channels disagreed for a reason unrelated to cells: the build that wrote these
+    // fixtures stopped emitting `_fields` in a text dictionary and StructNode.parse built a
+    // scalar struct's field children from `_fields` alone (defect 56, fixed). With that
+    // carve-out gone the assertion reaches the fields of every struct element as well.
     const shown = (root: any, name: string): string[] => {
       const out: string[] = [];
       const walk = (n: any, path: string): void => {
         out.push(path + '  ' + String(n.displayValue) + ' | ' + String(n.dataType ?? '') + ' | ' + String(n.className ?? ''));
-        if (n.dataType === 'struct' && String(n.displayValue) === '<1x1 struct>') {
-          return;
-        }
         for (const c of n.children ?? []) {
           walk(c, path + '/' + c.name);
         }
@@ -642,9 +632,10 @@ describe('defects 53-55: an array inside a cell keeps its shape, its parts and i
       expect(shown(bin, name), name).toEqual(shown(txt, name));
     }
     // And a row count, so a walk that silently visited only the entry rows could not pass:
-    // the six defect cases have 32 rows between them (an entry and its element each, plus
-    // 2 + 2 + 8 numeric parts, 2 + 4 struct elements, and 2 objects).
-    expect(DEFECTS.reduce((n, [name]) => n + shown(bin, name).length, 0)).toBe(32);
+    // the six defect cases have 38 rows between them (an entry and its element each, plus
+    // 2 + 2 + 8 numeric parts, 2 + 4 struct elements and the `a` field of each of those
+    // six, and 2 objects).
+    expect(DEFECTS.reduce((n, [name]) => n + shown(bin, name).length, 0)).toBe(38);
   });
 
   it('writes each array back the way MATLAB spells it', () => {
diff --git a/test/parity/matlab/DESIGN.md b/test/parity/matlab/DESIGN.md
index 4b269be..7b75b6d 100644
--- a/test/parity/matlab/DESIGN.md
+++ b/test/parity/matlab/DESIGN.md
@@ -1947,10 +1947,10 @@ READER did with what MATLAB wrote.
       fields, nested, struct array, every field class) got `_fields` on **none** of them.
       So on current MATLAB a struct in a text `.sldd` shows no field row at all: the
       fields are invisible and uneditable. This is a live defect with a far wider blast
-      radius than 52, it is NOT fixed here, and it is the case the README's own warning
-      describes — MATLAB changed its answer, which is a finding and not a test to fix.
-      `binaryWriteBackGate.test.ts` excludes that one struct field from its cross-channel
-      comparison and says why; nothing asserts the broken behaviour.
+      radius than 52, and it is the case the README's own warning describes — MATLAB
+      changed its answer, which is a finding and not a test to fix. **Fixed separately as
+      defect 56, below**; the cross-channel exclusions it forced in
+      `binaryWriteBackGate.test.ts` are gone with it.
 
 ## Three more, from asking what ELSE the cell site was missing
 
@@ -2027,6 +2027,90 @@ Two things this measurement settled and left alone:
   about it (text `1…12`, binary `0…11`). Visible in the fixtures here, unrelated to cells,
   not asserted either way.
 
+## Reading a format that changes: derive from structure, do not trust a spelling
+
+53–55 were the same shape as 52 one level out. **56 is that question asked of the format
+itself**: where does a reader depend on MATLAB spelling something a particular way, such
+that MATLAB changing its mind is silent data loss? The answer turned out to be already
+sitting in the notes above, recorded as a neighbour of 52 and not yet fixed.
+
+56. **A struct in a current-MATLAB text `.sldd` showed no field rows, and a save deleted
+    its fields from the file.** `StructNode.parse` built a struct's children from
+    `rawVal._fields` alone, and build `27.1.0.3393633` stopped writing `_fields` where
+    `27.1.0.3353139` wrote it — so `fields` was `[]`, no field row was built even though
+    `_elements[0]` held every field, and `serializeElement`, which iterates the same list,
+    re-serialized the struct as `_elements: [{}]`. Measured on MATLAB's own bytes: every
+    struct in `cellarr_text.sldd` and `cellstr_text.sldd` (8 of them, including the
+    elements of a struct array and a struct inside a cell) came up empty, while every
+    struct in the older `typed_text.sldd`, `nd_nested.sldd` and `object_props_text.sldd`
+    was correct. No edit to the fields was needed for the loss — any edit under the entry
+    drops `_rawInput` and the re-serialize does the rest.
+
+    **Four parsers build this envelope and three already DERIVED the list** —
+    `BinarySlddParser` (`_fields: Object.keys(parsed[0])`), `McosParser`,
+    `MatlabVariableNode` — so the binary channel was right throughout and only the text
+    channel, which passes MATLAB's JSON straight through, was wrong. That is the whole
+    lesson in one file: *the channel that derived from structure survived the format
+    change; the channel that trusted the key did not.*
+
+    Fixed with `fieldsOf(rawVal)` in `StructNode.ts`, in the one place all four channels
+    funnel through: an explicit `_fields` still wins (it is the only statement of field
+    ORDER an envelope carries), and absent it the names are the keys of element 0 — element
+    0 and not a union, because a struct array shares one field list by definition and that
+    is the rule the binary parser already applied. `serial._fields` is therefore always an
+    array, which is what lets `serializeElement`, `_renameField` and the
+    add/remove/restore hooks read one list that is already right instead of each deciding
+    what a missing key means. `addChildNode`'s `if (!this.serial._fields) { = [] }` was a
+    latent second bug on the same line — it would have built a list holding only the new
+    field — and it is unreachable now.
+
+    The writer stays faithful: `_fieldsDeclared` records whether the INPUT declared the
+    key, and only then is it emitted, so a save does not add `_fields` back to a file
+    MATLAB left it out of. A struct WE invent (`createDefault`) declares an empty one, so
+    its behaviour is unchanged — the emit policy exists to avoid contradicting a MATLAB
+    file, and there is no such file in that case.
+
+    Gated by `structFieldsAcrossBuilds.test.ts`, which asserts both builds' bytes as the
+    SAME assertion (a reader is not allowed to care which build it is reading), walks the
+    text channel against the binary one all the way down, and checks both halves of the
+    write: every field kept, `_fields` not invented, `_fields` preserved where it existed.
+    Reverting the derivation alone fails 11 tests across that file and
+    `binaryWriteBackGate.test.ts`, whose two cross-channel carve-outs for this defect are
+    now gone — the walk stops nowhere and `sStr`'s field is compared like everything else.
+
+Two enumerations hardened in the same pass, both inert against every byte MATLAB has
+written and both closing a failure mode that already happened once:
+
+- **`isNumericClass` is a pattern, not a list, and `parseTypedValue` no longer keeps a
+  second copy of it.** The integer family is `u?int(8|16|32|64)`, so it cannot omit a
+  width, and the nine `case` labels that duplicated the same set are one
+  `isNumericClass(className)` in the `default` arm. Defect 27 was precisely that
+  duplication: int64/uint64 missing from BOTH lists, the value falling through to the
+  bare-text return, the writer spelling it `Class="char"`.
+- **`IsComplex` accepts `"true"` as well as `"1"`**, through one `isComplexAttr` helper
+  rather than three literal comparisons — the same latitude `parseTypedValue`'s `logical`
+  arm has always taken. The asymmetry is the argument: an unrecognized spelling does not
+  merely mis-display, it drops the imaginary parts from the value AND from the next save,
+  which is defect 53's exact shape.
+
+Two findings from that hardening, measured and deliberately NOT acted on:
+
+- **The entry site is permissive in a way that corrupts, and the field site's narrowness is
+  the safer of the two failures.** `parseEntryValue` accepts ANY class and formats it as a
+  number, so `Class="half">1.5` writes back `2` and a class whose body is not numeric at
+  all writes back `0`; `parseTypedValue`'s `default` arm drops the class and keeps the
+  characters. So `half` is deliberately absent from `NUMERIC_CLASS` — admitting it there
+  would trade a wrong type for wrong digits — and the field site was NOT aligned with the
+  entry site, which was the change this audit set out to make until the measurement said
+  otherwise. Nothing in the whole MATLAB-authored binary corpus reaches that arm: the only
+  `<P Class=...>` values anywhere in it are `char`, `double`, `logical`, `cell`, `struct`
+  and the ten numeric classes.
+- **`writeIntoSaveobj` asks `fields.includes(key)` of the same envelope and is NOT
+  affected**, because `SAVEOBJ_KEY` is set only by `BinarySlddParser` — the saveobj
+  envelope is a binary-channel concept and that channel derives its own `_fields`. Checked
+  rather than assumed; it is the one other place in the model layer that reads `_fields` to
+  decide something.
+
 ## Known limitations, to verify and document
 
 - **Derived MCOS classes.** A customer class `MyParam < Simulink.Parameter`
diff --git a/test/structFieldsAcrossBuilds.test.ts b/test/structFieldsAcrossBuilds.test.ts
new file mode 100644
index 0000000..9b5fec1
--- /dev/null
+++ b/test/structFieldsAcrossBuilds.test.ts
@@ -0,0 +1,159 @@
+// Copyright 2026 The MathWorks, Inc.
+//
+// A struct's field list is read from the ELEMENT BAG, not trusted from `_fields`.
+//
+// MATLAB changed its answer. Build `27.1.0.3353139` wrote a `"_fields": ["a","b"]`
+// array beside `_elements` in a text (JSON) dictionary; build `27.1.0.3393633` writes
+// none at all, and the field names live only as the keys of `_elements[i]`.
+// `StructNode.parse` built a struct's children from `_fields` alone, so on current
+// MATLAB every struct in every text `.sldd` came up with NO field rows — invisible and
+// uneditable — and, because `serializeElement` iterates the same list, a struct that was
+// then modified re-serialized as `_elements: [{}]` and every field was deleted from the
+// saved file.
+//
+// Four parsers build this envelope and three of them already DERIVED the list
+// (`BinarySlddParser`'s `_fields: Object.keys(parsed[0])`, `McosParser`,
+// `MatlabVariableNode`); only the text channel passed MATLAB's JSON straight through.
+// So the channel that derived from structure survived the format change and the channel
+// that trusted the spelling broke — which is why the fix is to derive in the one place
+// all four channels funnel through, rather than to teach the text parser to synthesize
+// the key MATLAB dropped.
+//
+// Both builds' bytes are asserted here on purpose: a fix that reads the element bag must
+// also still honour an explicit `_fields`, which is the only thing that states field
+// ORDER for a bag whose keys a reader might reorder, and must not start writing `_fields`
+// into a file MATLAB left it out of.
+import { describe, it, expect } from 'vitest';
+import StructNode from '../src/datamodel/node/data/StructNode.js';
+import '../src/datamodel/node/data/NodeClassMap.js';
+import { loadFile, findEntry } from './parity/loadFile.js';
+
+// Every struct MATLAB wrote into these fixtures, with the fields it wrote, keyed by the
+// build that wrote them. The point of the table is that the two halves are the SAME
+// assertion — the reader is not allowed to care which build it is reading.
+const WITH_FIELDS: Array<[string, string, string[]]> = [
+  ['typed_text.sldd', 'sTyped', ['a', 'b', 'c', 'd']],
+  ['typed_text.sldd', 'sCharMat', ['m', 'r']],
+  ['nd_nested.sldd', 'ndInStruct', ['flat', 'deep']],
+  ['nd_nested.sldd', 'ndTwoLevel', ['inner']],
+  ['object_props_text.sldd', 'a', ['b', 'c']],
+];
+
+const WITHOUT_FIELDS: Array<[string, string, string[]]> = [
+  ['cellarr_text.sldd', 'sStructArr', ['f']],
+  ['cellarr_text.sldd', 'sObjArr', ['f']],
+  ['cellstr_text.sldd', 'sStr', ['f']],
+];
+
+describe('a struct read from MATLAB text bytes shows its fields, in either build', () => {
+  for (const [fixture, entry, fields] of [...WITH_FIELDS, ...WITHOUT_FIELDS]) {
+    it(fixture + ' / ' + entry + ' has fields ' + fields.join(','), () => {
+      const node = findEntry(loadFile('../fixtures/' + fixture, fixture), entry);
+      expect(node.children.map((c: any) => c.name)).toEqual(fields);
+    });
+  }
+
+  it('reaches the fields of every element of a struct array, and of a struct in a cell', () => {
+    // Nesting is where the blast radius actually is: `_fields` was threaded down to each
+    // element node, so an empty list at the top emptied every element too. A struct inside
+    // a CELL reaches StructNode.parse by a third route again.
+    const root = loadFile('../fixtures/cellarr_text.sldd', 'cellarr_text.sldd');
+    const arr = findEntry(root, 'cStructArr').children[0];
+    expect(String(arr.displayValue)).toBe('<1x2 struct>');
+    expect(arr.children.map((e: any) => e.children.map((c: any) => c.name))).toEqual([['a'], ['a']]);
+    const scalar = findEntry(root, 'cStruct').children[0];
+    expect(scalar.children.map((c: any) => c.name)).toEqual(['a']);
+  });
+
+  it('reads a struct the same way the binary channel does, all the way down', () => {
+    // The invariant stated BETWEEN the channels rather than inside either one — this
+    // repo's recurring defect class. The binary channel is the oracle precisely because
+    // it already derived the list; before the fix the two disagreed about every struct,
+    // and `binaryWriteBackGate` had to stop its cross-channel walk at a scalar struct to
+    // avoid the disagreement. Nothing stops it now.
+    const bin = loadFile('../fixtures/cellarr_binary.sldd', 'cellarr_binary.sldd');
+    const txt = loadFile('../fixtures/cellarr_text.sldd', 'cellarr_text.sldd');
+    const shown = (root: any, name: string): string[] => {
+      const out: string[] = [];
+      const walk = (n: any, path: string): void => {
+        out.push(path + '  ' + String(n.displayValue) + ' | ' + String(n.dataType ?? ''));
+        for (const c of n.children ?? []) { walk(c, path + '/' + c.name); }
+      };
+      walk(findEntry(root, name), name);
+      return out;
+    };
+    for (const name of ['sStructArr', 'cStruct', 'cStructArr', 'cStructArr2D']) {
+      expect(shown(bin, name), name).toEqual(shown(txt, name));
+    }
+  });
+});
+
+describe('writing a struct back keeps its fields, and keeps the file MATLAB-shaped', () => {
+  // The silent half. `serializeValue` replays `_rawInput` verbatim until something is
+  // modified, so the loss needed no edit to the fields themselves — any edit under the
+  // entry was enough to drop the raw bytes and re-serialize from an empty field list.
+  const serializeModified = (fixture: string, entry: string): Record<string, unknown> => {
+    const node: any = findEntry(loadFile('../fixtures/' + fixture, fixture), entry);
+    node._markModified();
+    return node.serializeValue() as Record<string, unknown>;
+  };
+
+  it('keeps every field of a struct MATLAB wrote without _fields', () => {
+    const out = serializeModified('cellarr_text.sldd', 'sStructArr');
+    const elements = out._elements as Record<string, unknown>[];
+    expect(Object.keys(elements[0])).toEqual(['f']);
+    // The field's own value has to survive too, not just its name: a 1x2 struct array.
+    expect((elements[0].f as Record<string, unknown>)._dimensions).toEqual([1, 2]);
+  });
+
+  it('does not invent _fields in a file MATLAB left it out of', () => {
+    // Faithfulness is not cosmetic here: the whole reason the reader may not depend on
+    // `_fields` is that MATLAB's own writer dropped it, so writing it back would make our
+    // saves diverge from MATLAB's for every struct in every dictionary.
+    expect(serializeModified('cellarr_text.sldd', 'sStructArr')).not.toHaveProperty('_fields');
+  });
+
+  it('keeps _fields in a file that had it, in MATLAB\'s own order', () => {
+    expect(serializeModified('typed_text.sldd', 'sTyped')._fields).toEqual(['a', 'b', 'c', 'd']);
+  });
+});
+
+describe('StructNode.parse derives the field list', () => {
+  it('prefers an explicit _fields, which is the only statement of field ORDER', () => {
+    // An element bag's key order is a JSON object's key order. Where MATLAB stated the
+    // order outright, that statement wins — deriving would be a silent reordering of the
+    // user's struct.
+    const node = StructNode.parse({
+      _array_type: 'Struct', _dimensions: [1, 1],
+      _fields: ['b', 'a'], _elements: [{ a: 1, b: 2 }],
+    }, 'S', null);
+    expect(node.children.map((c) => c.name)).toEqual(['b', 'a']);
+  });
+
+  it('derives from the element bag when _fields is absent', () => {
+    const node = StructNode.parse({
+      _array_type: 'Struct', _dimensions: [1, 1], _elements: [{ a: 1, b: 2 }],
+    }, 'S', null);
+    expect(node.children.map((c) => c.name)).toEqual(['a', 'b']);
+  });
+
+  it('derives a struct array\'s shared list from its first element, as the binary parser does', () => {
+    const node = StructNode.parse({
+      _array_type: 'Struct', _dimensions: [1, 2], _elements: [{ a: 1 }, { a: 2 }],
+    }, 'S', null);
+    expect(node.children.map((e) => e.children.map((c) => c.name))).toEqual([['a'], ['a']]);
+  });
+
+  it('adds a field to a derived list without dropping the ones MATLAB wrote', () => {
+    // The latent second bug: addChildNode's `if (!this.serial._fields) { = [] }` built a
+    // list holding ONLY the new field. Unreachable while the fields were invisible —
+    // there was no struct row to add to — and a field-deleting edit the moment they
+    // became visible again.
+    const node = StructNode.parse({
+      _array_type: 'Struct', _dimensions: [1, 1], _elements: [{ a: 1, b: 2 }],
+    }, 'S', null);
+    (node as any).addChildNode();
+    expect(node.children.map((c) => c.name)).toEqual(['a', 'b', 'field']);
+    expect(Object.keys((node as any).serializeElement())).toEqual(['a', 'b', 'field']);
+  });
+});
diff --git a/test/structNode.test.ts b/test/structNode.test.ts
index 2659b89..3bb8d2f 100644
--- a/test/structNode.test.ts
+++ b/test/structNode.test.ts
@@ -266,15 +266,18 @@ describe('StructNode.addChildNode', () => {
     expect((node as any).serial._fields).toEqual(['field', 'field1']);
   });
 
-  it('initializes _fields when the struct had none', () => {
-    // An empty struct parsed from a bare { _elements: [{}] } has no _fields
-    // array. addChildNode must create one rather than pushing onto undefined.
+  it('pushes onto the empty list parse derives for a struct with no fields', () => {
+    // A bare { _elements: [{}] } declares no _fields, and parse derives one from the
+    // element bag — empty, here, because the bag is. So the list addChildNode pushes
+    // onto always exists: `serial._fields` is an ARRAY for every parsed struct, which
+    // is what lets serializeElement and the rename/remove/restore hooks read it without
+    // each re-deciding what a missing key means. See structFieldsAcrossBuilds.test.ts.
     const node = StructNode.parse({
       _array_type: 'Struct',
       _dimensions: [1, 1],
       _elements: [{}],
     }, 'S', null);
-    expect((node as any).serial._fields).toBeUndefined();
+    expect((node as any).serial._fields).toEqual([]);
     (node as any).addChildNode();
     expect((node as any).serial._fields).toEqual(['field']);
   });