diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-sidebars-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-sidebars-controller.php
index 3c1a83f0db..b7a02cb673 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-sidebars-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-sidebars-controller.php
@@ -213,8 +213,9 @@ class WP_REST_Sidebars_Controller extends WP_REST_Controller {
 		 * Fires after a sidebar is updated via the REST API.
 		 *
 		 * @since 5.8.0
-		 * @param array           $sidebar  The updated sidebar.
-		 * @param WP_REST_Request $request  Request object.
+		 *
+		 * @param array           $sidebar The updated sidebar.
+		 * @param WP_REST_Request $request Request object.
 		 */
 		do_action( 'rest_save_sidebar', $sidebar, $request );
 
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 35cd9b4f94..be84173feb 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
@@ -360,6 +360,7 @@ class WP_REST_Widgets_Controller extends WP_REST_Controller {
 		 * Fires after a widget is deleted via the REST API.
 		 *
 		 * @since 5.8.0
+		 *
 		 * @param string           $widget_id  ID of the widget marked for deletion.
 		 * @param string           $sidebar_id ID of the sidebar the widget was deleted from.
 		 * @param WP_REST_Response $response   The response data.
@@ -413,14 +414,14 @@ class WP_REST_Widgets_Controller extends WP_REST_Controller {
 			$id_base       = $parsed_id['id_base'];
 			$number        = isset( $parsed_id['number'] ) ? $parsed_id['number'] : null;
 			$widget_object = $wp_widget_factory->get_widget_object( $id_base );
-			$creating      = false;
+			$update        = true;
 		} elseif ( $request['id_base'] ) {
 			// Saving a new widget.
 			$id_base       = $request['id_base'];
 			$widget_object = $wp_widget_factory->get_widget_object( $id_base );
 			$number        = $widget_object ? next_widget_id_number( $id_base ) : null;
 			$id            = $widget_object ? $id_base . '-' . $number : $id_base;
-			$creating      = true;
+			$update        = false;
 		} else {
 			return new WP_Error(
 				'rest_invalid_widget',
@@ -520,12 +521,13 @@ class WP_REST_Widgets_Controller extends WP_REST_Controller {
 		 * Fires after a widget is created or updated via the REST API.
 		 *
 		 * @since 5.8.0
+		 *
 		 * @param string          $id         ID of the widget being saved.
 		 * @param string          $sidebar_id ID of the sidebar containing the widget being saved.
 		 * @param WP_REST_Request $request    Request object.
-		 * @param bool            $creating   True when creating a widget, false when updating.
+		 * @param bool            $update     Whether this is an existing widget being updated.
 		 */
-		do_action( 'rest_after_save_widget', $id, $sidebar_id, $request, $creating );
+		do_action( 'rest_after_save_widget', $id, $sidebar_id, $request, $update );
 
 		return $id;
 	}
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 8dd752e1f2..3b2a01ee06 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.8-alpha-51070';
+$wp_version = '5.8-alpha-51071';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.