diff --git a/wp-includes/block-template-utils.php b/wp-includes/block-template-utils.php
index 6a53fd6730..28efb5cbad 100644
--- a/wp-includes/block-template-utils.php
+++ b/wp-includes/block-template-utils.php
@@ -913,7 +913,7 @@ function block_footer_area() {
  */
 function wp_generate_block_templates_export_file() {
 	if ( ! class_exists( 'ZipArchive' ) ) {
-		return new WP_Error( __( 'Zip Export not supported.' ) );
+		return new WP_Error( 'missing_zip_package', __( 'Zip Export not supported.' ) );
 	}
 
 	$obscura  = wp_generate_password( 12, false, false );
@@ -921,7 +921,7 @@ function wp_generate_block_templates_export_file() {
 
 	$zip = new ZipArchive();
 	if ( true !== $zip->open( $filename, ZipArchive::CREATE ) ) {
-		return new WP_Error( __( 'Unable to open export file (archive) for writing.' ) );
+		return new WP_Error( 'unable_to_create_zip', __( 'Unable to open export file (archive) for writing.' ) );
 	}
 
 	$zip->addEmptyDir( 'theme' );
diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-edit-site-export-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-edit-site-export-controller.php
index 1bd40cd637..d5abfa5682 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-edit-site-export-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-edit-site-export-controller.php
@@ -54,8 +54,8 @@ class WP_REST_Edit_Site_Export_Controller extends WP_REST_Controller {
 	 */
 	public function permissions_check() {
 		if ( ! current_user_can( 'edit_theme_options' ) ) {
-			new WP_Error(
-				'rest_cannot_view_url_details',
+			return new WP_Error(
+				'rest_cannot_export_templates',
 				__( 'Sorry, you are not allowed to export templates and template parts.' ),
 				array( 'status' => rest_authorization_required_code() )
 			);
diff --git a/wp-includes/version.php b/wp-includes/version.php
index bf4440d189..a427642995 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.9-beta1-52339';
+$wp_version = '5.9-beta1-52340';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.