Slug redirection

Hi @alprio,

Unfortunately, there is no out-of-box solution available. A few years ago I prepared a custom snippet that should do exactly what you are trying to do. Here is the code:

function pm_force_404_on_native_permalinks() {
	global $wp_query, $pm_query, $permalink_manager_uris;

	// 1. Get the queried object
	$object = get_queried_object();

	// 2. Use it only if no custom permalink is detected
	if ( ! empty( $pm_query['id'] ) ) {
		return;
	}

	// 3. Check if the custom permalink exists for requested item
	if ( ! empty( $object->post_type ) ) {
		$has_custom_uri = $permalink_manager_uris[ $object->ID ];
	}

	// 4. Force "404" error page
	if ( ! empty( $has_custom_uri ) ) {
		$wp_query->query = $wp_query->queried_object = $wp_query->queried_object_id = null;
		$wp_query->set_404();
		status_header( 404 );
		nocache_headers();
		$pm_query = '';

		// Disable canonical redirect
		remove_action( 'template_redirect', 'wp_old_slug_redirect' );
		remove_action( 'template_redirect', 'redirect_canonical' );
	}
}
add_action( 'wp', 'pm_force_404_on_native_permalinks', 5 );

Hi @alprio,

Yes, as this requires Pro version to work, please send the support request with your license key here:
https://permalinkmanager.pro/contact/