fix: resolve decomposed Permission Set parents by suffix

src/resolve/adapters/baseSourceAdapter.ts

@@ -110,9 +110,12 @@ export abstract class BaseSourceAdapter implements SourceAdapter {
         const typeDirName = basename(this.type.inFolder ? dirname(parentPath) : parentPath);
         const nameMatchesParent = basename(parentPath) === metaXml.fullName;
         const inTypeDir = typeDirName === this.type.directoryName;
-        // if the parent folder name matches the fullName OR parent folder name is
-        // metadata type's directory name, it's a root metadata xml.
-        isRootMetadataXml = nameMatchesParent || inTypeDir;
+        const rootSuffixes = [this.type.suffix, this.type.legacySuffix].filter(Boolean);
+        const suffixMatchesRoot = rootSuffixes.includes(metaXml.suffix);
+        // Decomposed children can share the parent fullName (for example,
+        // MyPermissionSet.applicationVisibility-meta.xml). The suffix must
+        // identify the parent before the directory name can confirm it.
+        isRootMetadataXml = suffixMatchesRoot && (nameMatchesParent || inTypeDir);
       } else {
         isRootMetadataXml = true;
       }

src/resolve/adapters/mixedContentSourceAdapter.ts

@@ -16,7 +16,7 @@
 import { dirname, basename, sep, join } from 'node:path';
 import { Messages } from '@salesforce/core/messages';
 import { SfError } from '@salesforce/core/sfError';
-import { baseName } from '../../utils/path';
+import { baseName, parseMetadataXml } from '../../utils/path';
 import { SourcePath } from '../../common/types';
 import { SourceComponent } from '../sourceComponent';
 import { BaseSourceAdapter } from './baseSourceAdapter';
@@ -55,6 +55,19 @@ export class MixedContentSourceAdapter extends BaseSourceAdapter {
   protected getRootMetadataXmlPath(trigger: SourcePath): SourcePath | undefined {
     if (this.ownFolder) {
       const componentRoot = this.trimPathToContent(trigger);
+
+      const rootSuffixes = [this.type.suffix, this.type.legacySuffix].filter(
+        (suffix): suffix is string => typeof suffix === 'string'
+      );
+      const rootFile = this.tree.readDirectory(componentRoot).find((entry) => {
+        const metadata = parseMetadataXml(join(componentRoot, entry));
+        return metadata?.suffix !== undefined && rootSuffixes.includes(metadata.suffix);
+      });
+
+      if (rootFile) {
+        return join(componentRoot, rootFile);
+      }
+
       return this.tree.find('metadataXml', basename(componentRoot), componentRoot);
     }
     return this.findMetadataFromContent(trigger);

test/resolve/metadataResolver.test.ts

@@ -183,6 +183,16 @@ describe('MetadataResolver', () => {
         expect(components2[0].type.name).to.equal('PermissionSet');
       });
 
+      it('Should resolve the Beta2 Permission Set parent when resolving its directory', () => {
+        const resolver = new MetadataResolver(regAccPermissionSet, SOURCE_FORMAT_PS.tree);
+        const permissionSetDirectory = join('main', 'default', 'permissionsets', 'myPS');
+        const components = resolver.getComponentsFromPath(permissionSetDirectory);
+
+        expect(components).to.have.lengthOf(1);
+        expect(components[0].type.name).to.equal('PermissionSet');
+        expect(components[0].xml).to.equal(join(permissionSetDirectory, 'myPS.permissionset-meta.xml'));
+      });
+
       it('Should determine type for metadata file with known suffix and strictDirectoryName', () => {
         // CustomSite is an example.  The conditions are:
         //   1. Type has "strictDirectoryName": true