--- a/wp/wp-includes/widgets/class-wp-widget-search.php	Tue Dec 15 15:52:01 2020 +0100
+++ b/wp/wp-includes/widgets/class-wp-widget-search.php	Wed Sep 21 18:19:35 2022 +0200
@@ -26,6 +26,7 @@
 			'classname'                   => 'widget_search',
 			'description'                 => __( 'A search form for your site.' ),
 			'customize_selective_refresh' => true,
+			'show_instance_in_rest'       => true,
 		);
 		parent::__construct( 'search', _x( 'Search', 'Search widget' ), $widget_ops );
 	}