diff --git a/packages/layout-engine/layout-resolved/src/versionSignature.ts b/packages/layout-engine/layout-resolved/src/versionSignature.ts
index 89d56326f8..f79b0838eb 100644
--- a/packages/layout-engine/layout-resolved/src/versionSignature.ts
+++ b/packages/layout-engine/layout-resolved/src/versionSignature.ts
@@ -50,9 +50,40 @@ const getSdtMetadataLockMode = (metadata: SdtMetadata | null | undefined): strin
   return metadata.type === 'structuredContent' ? (metadata.lockMode ?? '') : '';
 };
 
+const getSdtMetadataAlias = (metadata: SdtMetadata | null | undefined): string => {
+  if (!metadata) return '';
+  if ('alias' in metadata && metadata.alias != null) {
+    return String(metadata.alias);
+  }
+  return '';
+};
+
+const getSdtMetadataTag = (metadata: SdtMetadata | null | undefined): string => {
+  if (!metadata) return '';
+  if ('tag' in metadata && metadata.tag != null) {
+    return String(metadata.tag);
+  }
+  return '';
+};
+
+const getSdtMetadataAppearance = (metadata: SdtMetadata | null | undefined): string => {
+  if (!metadata) return '';
+  if (metadata.type === 'structuredContent' && 'appearance' in metadata && metadata.appearance != null) {
+    return String(metadata.appearance);
+  }
+  return '';
+};
+
 const getSdtMetadataVersion = (metadata: SdtMetadata | null | undefined): string => {
   if (!metadata) return '';
-  return [metadata.type, getSdtMetadataLockMode(metadata), getSdtMetadataId(metadata)].join(':');
+  return [
+    metadata.type,
+    getSdtMetadataLockMode(metadata),
+    getSdtMetadataId(metadata),
+    getSdtMetadataAlias(metadata),
+    getSdtMetadataTag(metadata),
+    getSdtMetadataAppearance(metadata),
+  ].join(':');
 };
 
 const getTrackedChangeLayers = (run: TextRun): TrackedChangeMeta[] => {
@@ -359,6 +390,8 @@ export const deriveBlockVersion = (block: FlowBlock): string => {
           textRun.comments?.length ?? 0,
           // SD-3098: DomPainter reads run.bidi to apply dir + RLM injection; signature must include it.
           textRun.bidi ? JSON.stringify(textRun.bidi) : '',
+          // Include inline SDT metadata (alias, tag, etc.) so changes trigger repaint.
+          getSdtMetadataVersion(textRun.sdt),
         ].join(',');
       })
       .join('|');
diff --git a/packages/layout-engine/pm-adapter/src/sdt/metadata.ts b/packages/layout-engine/pm-adapter/src/sdt/metadata.ts
index 322bad72e5..ad5eb55aa6 100644
--- a/packages/layout-engine/pm-adapter/src/sdt/metadata.ts
+++ b/packages/layout-engine/pm-adapter/src/sdt/metadata.ts
@@ -6,29 +6,10 @@
  * document sections, TOC entries, structured content blocks, etc.
  */
 
-import type {
-  FlowBlock,
-  TableBlock,
-  ListBlock,
-  SdtMetadata,
-  FieldAnnotationMetadata,
-  StructuredContentMetadata,
-  DocumentSectionMetadata,
-  DocPartMetadata,
-} from '@superdoc/contracts';
+import type { FlowBlock, TableBlock, ListBlock, SdtMetadata } from '@superdoc/contracts';
 import type { PMNode } from '../types.js';
 import { resolveSdtMetadata } from '@superdoc/style-engine';
 
-type SdtMetadataForOverride<TOverride extends string | undefined> = TOverride extends 'fieldAnnotation'
-  ? FieldAnnotationMetadata
-  : TOverride extends 'structuredContent' | 'structuredContentBlock'
-    ? StructuredContentMetadata
-    : TOverride extends 'documentSection'
-      ? DocumentSectionMetadata
-      : TOverride extends 'docPartObject'
-        ? DocPartMetadata
-        : SdtMetadata;
-
 /**
  * Type guard to check if a node has instruction attribute.
  */
@@ -76,16 +57,17 @@ export function getDocPartObjectId(node: PMNode): string | undefined {
  * @param overrideType - Optional type override (e.g., 'documentSection', 'docPartObject')
  * @returns Resolved SDT metadata, or undefined if none
  */
-export function resolveNodeSdtMetadata<TOverride extends string | undefined = undefined>(
-  node: PMNode,
-  overrideType?: TOverride,
-): SdtMetadataForOverride<TOverride> | undefined {
+export function resolveNodeSdtMetadata(node: PMNode, overrideType?: string): SdtMetadata | undefined {
   const attrs = node.attrs;
   if (!attrs) return undefined;
   const nodeType = overrideType ?? node.type;
   if (!nodeType) return undefined;
-  const cacheKey =
-    typeof attrs.hash === 'string'
+  // Don't pass cacheKey for structuredContent - let buildSdtCacheKey use full attrs
+  // This ensures mutable properties are included in the cache key
+  const isStructuredContent = nodeType === 'structuredContent' || nodeType === 'structuredContentBlock';
+  const cacheKey = isStructuredContent
+    ? undefined
+    : typeof attrs.hash === 'string'
       ? attrs.hash
       : typeof attrs.id === 'string'
         ? attrs.id
@@ -96,7 +78,7 @@ export function resolveNodeSdtMetadata<TOverride extends string | undefined = un
     nodeType,
     attrs,
     cacheKey,
-  }) as SdtMetadataForOverride<TOverride> | undefined;
+  });
 }
 
 /**
diff --git a/packages/layout-engine/style-engine/src/index.ts b/packages/layout-engine/style-engine/src/index.ts
index 7fa06ce00e..579a3bf216 100644
--- a/packages/layout-engine/style-engine/src/index.ts
+++ b/packages/layout-engine/style-engine/src/index.ts
@@ -408,6 +408,15 @@ function buildSdtCacheKey(
 
   const id = toOptionalString(attrs.id);
   if (id) {
+    // For structuredContent, include mutable properties in the cache key
+    // so that changes to alias/tag/lockMode/appearance cause cache misses.
+    if (nodeType === 'structuredContent' || nodeType === 'structuredContentBlock') {
+      const alias = toOptionalString(attrs.alias) ?? '';
+      const tag = toOptionalString(attrs.tag) ?? '';
+      const lockMode = toOptionalString(attrs.lockMode) ?? '';
+      const appearance = toOptionalString(attrs.appearance) ?? '';
+      return `${nodeType}:${id}:${alias}:${tag}:${lockMode}:${appearance}`;
+    }
     return `${nodeType}:${id}`;
   }