diff --git a/src/wp-includes/rest-api/endpoints/class-wp-rest-abilities-v1-categories-controller.php b/src/wp-includes/rest-api/endpoints/class-wp-rest-abilities-v1-categories-controller.php
index 2156109e53b32..abbce844ef52a 100644
--- a/src/wp-includes/rest-api/endpoints/class-wp-rest-abilities-v1-categories-controller.php
+++ b/src/wp-includes/rest-api/endpoints/class-wp-rest-abilities-v1-categories-controller.php
@@ -142,7 +142,7 @@ public function get_items( $request ) {
 	 * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
 	 */
 	public function get_item( $request ) {
-		$category = wp_get_ability_category( $request['slug'] );
+		$category = wp_has_ability_category( $request['slug'] ) ? wp_get_ability_category( $request['slug'] ) : null;
 		if ( ! $category ) {
 			return new WP_Error(
 				'rest_ability_category_not_found',
diff --git a/src/wp-includes/rest-api/endpoints/class-wp-rest-abilities-v1-list-controller.php b/src/wp-includes/rest-api/endpoints/class-wp-rest-abilities-v1-list-controller.php
index 21b417e83a1db..97d97ce379e8d 100644
--- a/src/wp-includes/rest-api/endpoints/class-wp-rest-abilities-v1-list-controller.php
+++ b/src/wp-includes/rest-api/endpoints/class-wp-rest-abilities-v1-list-controller.php
@@ -156,7 +156,7 @@ public function get_items( $request ) {
 	 * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
 	 */
 	public function get_item( $request ) {
-		$ability = wp_get_ability( $request['name'] );
+		$ability = wp_has_ability( $request['name'] ) ? wp_get_ability( $request['name'] ) : null;
 		if ( ! $ability || ! $ability->get_meta_item( 'show_in_rest' ) ) {
 			return new WP_Error(
 				'rest_ability_not_found',
diff --git a/src/wp-includes/rest-api/endpoints/class-wp-rest-abilities-v1-run-controller.php b/src/wp-includes/rest-api/endpoints/class-wp-rest-abilities-v1-run-controller.php
index e1ba08f549e93..9ba76fc2407b7 100644
--- a/src/wp-includes/rest-api/endpoints/class-wp-rest-abilities-v1-run-controller.php
+++ b/src/wp-includes/rest-api/endpoints/class-wp-rest-abilities-v1-run-controller.php
@@ -80,7 +80,7 @@ public function register_routes(): void {
 	 * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
 	 */
 	public function execute_ability( $request ) {
-		$ability = wp_get_ability( $request['name'] );
+		$ability = wp_has_ability( $request['name'] ) ? wp_get_ability( $request['name'] ) : null;
 		if ( ! $ability ) {
 			return new WP_Error(
 				'rest_ability_not_found',
@@ -141,7 +141,7 @@ public function validate_request_method( string $request_method, array $annotati
 	 * @return true|WP_Error True if the request has execution permission, WP_Error object otherwise.
 	 */
 	public function check_ability_permissions( $request ) {
-		$ability = wp_get_ability( $request['name'] );
+		$ability = wp_has_ability( $request['name'] ) ? wp_get_ability( $request['name'] ) : null;
 		if ( ! $ability || ! $ability->get_meta_item( 'show_in_rest' ) ) {
 			return new WP_Error(
 				'rest_ability_not_found',
@@ -239,7 +239,7 @@ private function get_input_from_request( $request ) {
 	 * @return mixed Coerced input, or the raw input when it cannot be safely coerced.
 	 */
 	public function sanitize_input_for_ability( $input, $request ) {
-		$ability = wp_get_ability( $request['name'] );
+		$ability = wp_has_ability( $request['name'] ) ? wp_get_ability( $request['name'] ) : null;
 		if ( ! $ability instanceof WP_Ability ) {
 			return $input;
 		}
diff --git a/tests/phpunit/tests/rest-api/wpRestAbilitiesV1CategoriesController.php b/tests/phpunit/tests/rest-api/wpRestAbilitiesV1CategoriesController.php
index f52fa32543d47..4a26112d7fd5c 100644
--- a/tests/phpunit/tests/rest-api/wpRestAbilitiesV1CategoriesController.php
+++ b/tests/phpunit/tests/rest-api/wpRestAbilitiesV1CategoriesController.php
@@ -219,8 +219,7 @@ public function test_get_item_with_selected_fields(): void {
 	 * Test getting a non-existent ability category returns 404.
 	 *
 	 * @ticket 64098
-	 *
-	 * @expectedIncorrectUsage WP_Ability_Categories_Registry::get_registered
+	 * @ticket 65644
 	 */
 	public function test_get_item_not_found(): void {
 		$request  = new WP_REST_Request( 'GET', '/wp-abilities/v1/categories/non-existent' );
diff --git a/tests/phpunit/tests/rest-api/wpRestAbilitiesV1ListController.php b/tests/phpunit/tests/rest-api/wpRestAbilitiesV1ListController.php
index 8361c750b266b..2fdfe9ae99d54 100644
--- a/tests/phpunit/tests/rest-api/wpRestAbilitiesV1ListController.php
+++ b/tests/phpunit/tests/rest-api/wpRestAbilitiesV1ListController.php
@@ -386,8 +386,7 @@ public function test_get_item_with_embed_context(): void {
 	 * Test getting a non-existent ability returns 404.
 	 *
 	 * @ticket 64098
-	 *
-	 * @expectedIncorrectUsage WP_Abilities_Registry::get_registered
+	 * @ticket 65644
 	 */
 	public function test_get_item_not_found(): void {
 		$request  = new WP_REST_Request( 'GET', '/wp-abilities/v1/abilities/non/existent' );
@@ -768,8 +767,7 @@ public function test_ability_name_with_invalid_special_characters( string $name
 	 * Test extremely long ability names.
 	 *
 	 * @ticket 64098
-	 *
-	 * @expectedIncorrectUsage WP_Abilities_Registry::get_registered
+	 * @ticket 65644
 	 */
 	public function test_extremely_long_ability_names(): void {
 		// Create a very long but valid ability name
diff --git a/tests/phpunit/tests/rest-api/wpRestAbilitiesV1RunController.php b/tests/phpunit/tests/rest-api/wpRestAbilitiesV1RunController.php
index 1d7d57d9aa59b..e8bc257b2a812 100644
--- a/tests/phpunit/tests/rest-api/wpRestAbilitiesV1RunController.php
+++ b/tests/phpunit/tests/rest-api/wpRestAbilitiesV1RunController.php
@@ -716,8 +716,7 @@ public function test_wp_error_return_handling(): void {
 	 * Test non-existent ability returns 404.
 	 *
 	 * @ticket 64098
-	 *
-	 * @expectedIncorrectUsage WP_Abilities_Registry::get_registered
+	 * @ticket 65644
 	 */
 	public function test_execute_non_existent_ability(): void {
 		$request = new WP_REST_Request( 'POST', '/wp-abilities/v1/abilities/non/existent/run' );