diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-widgets-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-widgets-controller.php
index 5fb9b8f6e1..9b97da4199 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-widgets-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-widgets-controller.php
@@ -289,13 +289,14 @@ class WP_REST_Widgets_Controller extends WP_REST_Controller {
 	 *
 	 * @since 5.8.0
 	 *
-	 * @global array $wp_registered_widget_updates The registered widget update functions.
+	 * @global array             $wp_registered_widget_updates The registered widget update functions.
+	 * @global WP_Widget_Factory $wp_widget_factory
 	 *
 	 * @param WP_REST_Request $request Full details about the request.
 	 * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
 	 */
 	public function delete_item( $request ) {
-		global $wp_registered_widget_updates;
+		global $wp_registered_widget_updates, $wp_widget_factory;
 
 		retrieve_widgets();
 
@@ -344,6 +345,17 @@ class WP_REST_Widgets_Controller extends WP_REST_Controller {
 			$_POST    = $original_post;
 			$_REQUEST = $original_request;
 
+			$widget_object = $wp_widget_factory->get_widget_object( $id_base );
+
+			if ( $widget_object ) {
+				/*
+				 * WP_Widget sets `updated = true` after an update to prevent more than one widget
+				 * from being saved per request. This isn't what we want in the REST API, though,
+				 * as we support batch requests.
+				 */
+				$widget_object->updated = false;
+			}
+
 			wp_assign_widget_to_sidebar( $widget_id, '' );
 
 			$response->set_data(
@@ -520,9 +532,11 @@ class WP_REST_Widgets_Controller extends WP_REST_Controller {
 			$widget_object->_set( $number );
 			$widget_object->_register_one( $number );
 
-			// WP_Widget sets updated = true after an update to prevent more
-			// than one widget from being saved per request. This isn't what we
-			// want in the REST API, though, as we support batch requests.
+			/*
+			 * WP_Widget sets `updated = true` after an update to prevent more than one widget
+			 * from being saved per request. This isn't what we want in the REST API, though,
+			 * as we support batch requests.
+			 */
 			$widget_object->updated = false;
 		}
 
diff --git a/wp-includes/version.php b/wp-includes/version.php
index b35cbf9883..cfd1538a12 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.8-RC1-51275';
+$wp_version = '5.8-RC1-51290';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.