diff --git a/packages/layout-engine/pm-adapter/src/sdt/document-part-object.test.ts b/packages/layout-engine/pm-adapter/src/sdt/document-part-object.test.ts
index 767398b0f1..72c4de5159 100644
--- a/packages/layout-engine/pm-adapter/src/sdt/document-part-object.test.ts
+++ b/packages/layout-engine/pm-adapter/src/sdt/document-part-object.test.ts
@@ -438,6 +438,34 @@ describe('document-part-object', () => {
       });
     });
 
+    // ==================== Table Children Tests ====================
+    describe('Table children', () => {
+      it('should process tableOfContents children for non-"Table of Contents" gallery types (e.g. "Custom Table of Contents")', () => {
+        const tocNode: PMNode = {
+          type: 'tableOfContents',
+          content: [{ type: 'paragraph', content: [] }],
+          attrs: { instruction: 'TOC \\o "1-3"' },
+        };
+        const node: PMNode = {
+          type: 'documentPartObject',
+          content: [tocNode],
+          attrs: { docPartGallery: 'Custom Table of Contents' },
+        };
+
+        vi.mocked(metadataModule.getDocPartGallery).mockReturnValue('Custom Table of Contents');
+        vi.mocked(metadataModule.getDocPartObjectId).mockReturnValue('toc-1');
+        vi.mocked(metadataModule.getNodeInstruction).mockReturnValue(undefined);
+        vi.mocked(metadataModule.resolveNodeSdtMetadata).mockReturnValue(undefined as never);
+
+        handleDocumentPartObjectNode(node, mockContext);
+
+        expect(tocModule.processTocChildren).toHaveBeenCalledOnce();
+        const callArgs = vi.mocked(tocModule.processTocChildren).mock.calls[0];
+        expect(callArgs[0]).toEqual(tocNode.content);
+        expect(callArgs[1]).toMatchObject({ docPartGallery: 'Custom Table of Contents' });
+      });
+    });
+
     // ==================== Edge Cases ====================
     describe('Edge cases', () => {
       it('should handle docPartGallery with different case sensitivity', () => {
diff --git a/packages/layout-engine/pm-adapter/src/sdt/document-part-object.ts b/packages/layout-engine/pm-adapter/src/sdt/document-part-object.ts
index 045ca3c91b..5e54fe5a1f 100644
--- a/packages/layout-engine/pm-adapter/src/sdt/document-part-object.ts
+++ b/packages/layout-engine/pm-adapter/src/sdt/document-part-object.ts
@@ -75,6 +75,24 @@ export function handleDocumentPartObjectNode(node: PMNode, context: NodeHandlerC
           blocks.push(block);
           recordBlockKind?.(block.kind);
         }
+      } else if (child.type === 'tableOfContents' && Array.isArray(child.content)) {
+        // A nested tableOfContents node (e.g. from a "Custom Table of Contents" SDT where
+        // the TOC field codes were preprocessed into an sd:tableOfContents element)
+        processTocChildren(
+          child.content,
+          { docPartGallery: docPartGallery ?? '', docPartObjectId, tocInstruction, sdtMetadata: docPartSdtMetadata },
+          {
+            nextBlockId,
+            positions,
+            bookmarks,
+            hyperlinkConfig,
+            enableComments,
+            trackedChangesConfig,
+            converters,
+            converterContext,
+          },
+          { blocks, recordBlockKind },
+        );
       }
     }
   }