}

		return $res;

	}

	/**
	 * Delete non-post type elements
	 *
	 * Currently handles deletion of question choices. In the future additional non-post type elements
	 * may be handled by this method.
	 *
	 * @since 3.37.12
	 *
	 * @param string $id Custom item ID. This should be a question choice id in the format of "{$question_id}:{$choice_id}".
	 * @return null|true|WP_Error `null` when the $id cannot be parsed into a question choice id.
	 *                            `true` on success.
	 *                            `WP_Error` when an error is encountered.
	 */
	private static function process_trash_item_non_post_type( $id ) {

		// Can't process.
		if ( false === strpos( $id, ':' ) ) {
			return null;