diff -u b/core/includes/theme.inc b/core/includes/theme.inc
--- b/core/includes/theme.inc
+++ b/core/includes/theme.inc
@@ -1365,7 +1365,6 @@
   // path-frontpage.
   $path = \Drupal::request()->getPathInfo();
   $variables['root_path'] = explode('/', $path)[1];
-  $variables['attributes']['class'] = $body_classes;
 
   $site_config = \Drupal::config('system.site');
   // Construct page title.