@@ -19,6 +19,7 @@ import {
 	applyPostChangesToCRDTDoc,
 	defaultSyncConfig,
 	getPostChangesFromCRDTDoc,
+	registerTaxonomyRestBases,
 } from './utils/crdt';
 
 export const DEFAULT_ENTITY_KEY = 'id';
@@ -417,6 +418,13 @@ async function loadTaxonomyEntities() {
 	const taxonomies = await apiFetch( {
 		path: '/wp/v2/taxonomies?context=view',
 	} );
+
+	// Auto-register all taxonomy rest_base values for CRDT sync.
+	const restBases = Object.values( taxonomies ?? {} )
+		.map( ( taxonomy ) => taxonomy.rest_base )
+		.filter( Boolean );
+	registerTaxonomyRestBases( restBases );
+
 	return Object.entries( taxonomies ?? {} ).map( ( [ name, taxonomy ] ) => {
 		const namespace = taxonomy?.rest_namespace ?? 'wp/v2';
 		const entity = {
 
@@ -95,6 +95,18 @@ const allowedPostProperties = new Set< string >( [
 	'title',
 ] );
 
+/**
+ * Register taxonomy rest_base values as allowed post properties for CRDT sync.
+ * Called during entity loading when taxonomies are fetched from the REST API.
+ *
+ * @param {string[]} restBases Array of taxonomy rest_base values to allow.
+ */
+export function registerTaxonomyRestBases( restBases: string[] ): void {
+	for ( const restBase of restBases ) {
+		allowedPostProperties.add( restBase );
+	}
+}
+
 // Post meta keys that should *not* be synced.
 const disallowedPostMetaKeys = new Set< string >( [
 	WORDPRESS_META_KEY_FOR_CRDT_DOC_PERSISTENCE,
 
@@ -18,6 +18,7 @@ import {
 import {
 	applyPostChangesToCRDTDoc,
 	getPostChangesFromCRDTDoc,
+	registerTaxonomyRestBases,
 	type PostChanges,
 	type YPostRecord,
 } from '../crdt';
@@ -630,4 +631,46 @@ describe( 'crdt', () => {
 			);
 		} );
 	} );
+
+	describe( 'registerTaxonomyRestBases', () => {
+		const mockPostType = {} as Type;
+
+		let map: YMapWrap< YPostRecord >;
+
+		beforeEach( () => {
+			map = getRootMap< YPostRecord >( doc, CRDT_RECORD_MAP_KEY );
+		} );
+
+		it( 'allows dynamically registered taxonomy properties to be synced', () => {
+			registerTaxonomyRestBases( [ 'genres' ] );
+
+			const changes = {
+				genres: [ 10, 15 ],
+			} as unknown as PostChanges;
+
+			applyPostChangesToCRDTDoc( doc, changes, mockPostType );
+
+			expect( map.get( 'genres' ) ).toEqual( [ 10, 15 ] );
+		} );
+
+		it( 'allows dynamically registered taxonomy properties to be read from CRDT', () => {
+			registerTaxonomyRestBases( [ 'genres' ] );
+
+			map.set( 'genres' as keyof YPostRecord, [ 10, 15 ] );
+
+			const editedRecord = {
+				genres: [ 10 ],
+			} as unknown as Post;
+
+			const changes = getPostChangesFromCRDTDoc(
+				doc,
+				editedRecord,
+				mockPostType
+			);
+
+			expect( ( changes as Record< string, unknown > ).genres ).toEqual( [
+				10, 15,
+			] );
+		} );
+	} );
 } );