diff --git a/core/lib/Drupal/Core/Render/Element/Container.php b/core/lib/Drupal/Core/Render/Element/Container.php
index 7989ba4..c7b79f7 100644
--- a/core/lib/Drupal/Core/Render/Element/Container.php
+++ b/core/lib/Drupal/Core/Render/Element/Container.php
@@ -93,11 +93,8 @@ public static function processContainer(&$element, FormStateInterface $form_stat
    */
   public static function preRenderContainer($element) {
     // Do not render optional container elements if there are no children.
-    if (isset($element['#parents'])) {
-      $group = implode('][', $element['#parents']);
-      if (!empty($element['#optional']) && !Element::getVisibleChildren($element['#groups'][$group])) {
-        $element['#printed'] = TRUE;
-      }
+    if (!empty($element['#optional']) && !Element::getVisibleChildren($element)) {
+      $element['#printed'] = TRUE;
     }
     return $element;
   }