only in patch2:
unchanged:
--- a/core/modules/user/user.module
+++ b/core/modules/user/user.module
@@ -559,9 +559,6 @@ function user_preprocess_block(&$variables) {
       case 'user_login_block':
         $variables['attributes']['role'] = 'form';
         break;
-      case 'user_new_block':
-        $variables['attributes']['role'] = 'complementary';
-        break;
       case 'user_online_block':
         $variables['attributes']['role'] = 'complementary';
         break;