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 dced990fcd..3b425a6b8b 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
@@ -236,6 +236,18 @@ class WP_REST_Widgets_Controller extends WP_REST_Controller {
 	public function update_item( $request ) {
 		global $wp_widget_factory;
 
+		/*
+		 * retrieve_widgets() contains logic to move "hidden" or "lost" widgets to the
+		 * wp_inactive_widgets sidebar based on the contents of the $sidebars_widgets global.
+		 *
+		 * When batch requests are processed, this global is not properly updated by previous
+		 * calls, resulting in widgets incorrectly being moved to the wp_inactive_widgets
+		 * sidebar.
+		 *
+		 * See https://core.trac.wordpress.org/ticket/53657.
+		 */
+		wp_get_sidebars_widgets();
+
 		retrieve_widgets();
 
 		$widget_id  = $request['id'];
@@ -300,6 +312,18 @@ class WP_REST_Widgets_Controller extends WP_REST_Controller {
 	public function delete_item( $request ) {
 		global $wp_widget_factory, $wp_registered_widget_updates;
 
+		/*
+		 * retrieve_widgets() contains logic to move "hidden" or "lost" widgets to the
+		 * wp_inactive_widgets sidebar based on the contents of the $sidebars_widgets global.
+		 *
+		 * When batch requests are processed, this global is not properly updated by previous
+		 * calls, resulting in widgets incorrectly being moved to the wp_inactive_widgets
+		 * sidebar.
+		 *
+		 * See https://core.trac.wordpress.org/ticket/53657.
+		 */
+		wp_get_sidebars_widgets();
+
 		retrieve_widgets();
 
 		$widget_id  = $request['id'];
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 3a59606970..32bee113b3 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.9-alpha-51431';
+$wp_version = '5.9-alpha-51432';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.