diff -r 48c4eec2b7e6 -r 8c2e4d02f4ef wp/wp-includes/rest-api/endpoints/class-wp-rest-block-pattern-categories-controller.php
--- a/wp/wp-includes/rest-api/endpoints/class-wp-rest-block-pattern-categories-controller.php	Fri Sep 05 18:40:08 2025 +0200
+++ b/wp/wp-includes/rest-api/endpoints/class-wp-rest-block-pattern-categories-controller.php	Fri Sep 05 18:52:52 2025 +0200
@@ -78,9 +78,14 @@
 	 * @since 6.0.0
 	 *
 	 * @param WP_REST_Request $request Full details about the request.
-	 * @return WP_Error|WP_REST_Response Response object on success, or WP_Error object on failure.
+	 * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
 	 */
 	public function get_items( $request ) {
+		if ( $request->is_method( 'HEAD' ) ) {
+			// Return early as this handler doesn't add any response headers.
+			return new WP_REST_Response( array() );
+		}
+
 		$response   = array();
 		$categories = WP_Block_Pattern_Categories_Registry::get_instance()->get_all_registered();
 		foreach ( $categories as $category ) {