diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-autosaves-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-autosaves-controller.php
index 6b2da40eb3..1eacba38e8 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-autosaves-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-autosaves-controller.php
@@ -371,19 +371,16 @@ class WP_REST_Autosaves_Controller extends WP_REST_Revisions_Controller {
 			}
 		}
 
-		if ( ! $autosave_is_different ) {
-			return new WP_Error(
-				'rest_autosave_no_changes',
-				__( 'There is nothing to save. The autosave and the post content are the same.' ),
-				array( 'status' => 400 )
-			);
-		}
-
 		$user_id = get_current_user_id();
 
 		// Store one autosave per author. If there is already an autosave, overwrite it.
 		$old_autosave = wp_get_post_autosave( $post_id, $user_id );
 
+		if ( ! $autosave_is_different && $old_autosave ) {
+			// Nothing to save, return the existing autosave.
+			return $old_autosave->ID;
+		}
+
 		if ( $old_autosave ) {
 			$new_autosave['ID']          = $old_autosave->ID;
 			$new_autosave['post_author'] = $user_id;
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 361fbc1647..69bed8706b 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.3-beta3-56162';
+$wp_version = '6.3-beta3-56163';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.