diff --git a/astrbot/core/star/command_management.py b/astrbot/core/star/command_management.py
index da3add17c6..54ddb5fb95 100644
--- a/astrbot/core/star/command_management.py
+++ b/astrbot/core/star/command_management.py
@@ -447,6 +447,8 @@ def _apply_config_to_runtime(
                 descriptor.filter_ref,
                 [str(x) for x in resolved_aliases if str(x).strip()],
             )
+        if isinstance(descriptor.filter_ref, CommandGroupFilter):
+            _refresh_sub_command_names(descriptor.filter_ref)
 
 
 def _bind_configs_to_descriptors(
@@ -485,6 +487,23 @@ def _set_filter_fragment(
         filter_ref._cmpl_cmd_names = None
 
 
+def _refresh_sub_command_names(group_filter: CommandGroupFilter) -> None:
+    """Propagate a group rename/alias change to its sub-filters.
+
+    Sub-filters snapshot ``parent_command_names`` at registration and cache
+    their complete names, so after the group's fragment or aliases change they
+    would keep matching only the old prefix. Refresh the snapshots and clear
+    the caches (recursively for nested groups).
+    """
+    for sub in group_filter.sub_command_filters:
+        if isinstance(sub, CommandGroupFilter):
+            sub._cmpl_cmd_names = None
+            _refresh_sub_command_names(sub)
+        elif isinstance(sub, CommandFilter):
+            sub.parent_command_names = group_filter.get_complete_command_names()
+            sub._cmpl_cmd_names = None
+
+
 def _set_filter_aliases(
     filter_ref: CommandFilter | CommandGroupFilter,
     aliases: list[str],
diff --git a/tests/test_command_management.py b/tests/test_command_management.py
new file mode 100644
index 0000000000..9608979c3f
--- /dev/null
+++ b/tests/test_command_management.py
@@ -0,0 +1,80 @@
+"""指令组重命名/别名向子指令传播（#9366）。"""
+
+from types import SimpleNamespace
+
+from astrbot.core.star.command_management import (
+    _apply_config_to_runtime,
+    _refresh_sub_command_names,
+    _set_filter_aliases,
+)
+from astrbot.core.star.filter.command import CommandFilter
+from astrbot.core.star.filter.command_group import CommandGroupFilter
+
+
+def _group_with_child() -> tuple[CommandGroupFilter, CommandFilter]:
+    group = CommandGroupFilter("example_cmd_group")
+    child = CommandFilter("sub_cmd", parent_command_names=["example_cmd_group"])
+    group.add_sub_command_filter(child)
+    return group, child
+
+
+def test_refresh_updates_child_parent_names_and_cache():
+    group, child = _group_with_child()
+    assert child.get_complete_command_names() == ["example_cmd_group sub_cmd"]
+    group.group_name = "/example_cmd_group"
+
+    _refresh_sub_command_names(group)
+
+    assert child.parent_command_names == ["/example_cmd_group"]
+    assert child._cmpl_cmd_names is None
+    assert child.get_complete_command_names() == ["/example_cmd_group sub_cmd"]
+
+
+def test_refresh_recurses_into_nested_groups():
+    root = CommandGroupFilter("root_group")
+    sub_group = CommandGroupFilter("mid_group", parent_group=root)
+    leaf = CommandFilter("leaf", parent_command_names=["root_group mid_group"])
+    sub_group.add_sub_command_filter(leaf)
+    root.add_sub_command_filter(sub_group)
+
+    sub_group.get_complete_command_names()
+    leaf.get_complete_command_names()
+    root.group_name = "/root_group"
+
+    _refresh_sub_command_names(root)
+
+    # the nested group's cache is rebuilt fresh from the renamed root
+    assert sub_group._cmpl_cmd_names == ["/root_group mid_group"]
+    assert leaf.parent_command_names == ["/root_group mid_group"]
+    assert leaf.get_complete_command_names() == ["/root_group mid_group leaf"]
+
+
+def test_apply_config_to_runtime_propagates_group_rename():
+    group, child = _group_with_child()
+    descriptor = SimpleNamespace(
+        handler=SimpleNamespace(enabled=True),
+        filter_ref=group,
+        current_fragment="/example_cmd_group",
+    )
+    config = SimpleNamespace(
+        enabled=True, resolved_command="/example_cmd_group", extra_data={}
+    )
+
+    _apply_config_to_runtime(descriptor, config)
+
+    assert group.group_name == "/example_cmd_group"
+    assert child.parent_command_names == ["/example_cmd_group"]
+    assert child.get_complete_command_names() == ["/example_cmd_group sub_cmd"]
+
+
+def test_apply_config_to_runtime_propagates_group_aliases():
+    group, child = _group_with_child()
+    _set_filter_aliases(group, ["eg"])
+
+    _refresh_sub_command_names(group)
+
+    assert child.parent_command_names == ["example_cmd_group", "eg"]
+    assert child.get_complete_command_names() == [
+        "example_cmd_group sub_cmd",
+        "eg sub_cmd",
+    ]