diff --git a/core/modules/field_ui/src/Form/FieldStorageAddForm.php b/core/modules/field_ui/src/Form/FieldStorageAddForm.php
index e5f15ea..5354b2e 100644
--- a/core/modules/field_ui/src/Form/FieldStorageAddForm.php
+++ b/core/modules/field_ui/src/Form/FieldStorageAddForm.php
@@ -234,9 +234,7 @@ public function buildForm(array $form, FormStateInterface $form_state, $entity_t
 
       $field_storage_form = $form_object->form([], $form_state);
       unset($field_storage_form['#process'], $field_storage_form['#after_build']);
-      foreach (Element::children($field_storage_form) as $key) {
-        $field_storage_form[$key]['#parents'] = ['new_storage_wrapper'];
-      }
+      $field_storage_form['cardinality_container']['#parents'] = ['new_storage_wrapper'];
 
       $form['new_storage_wrapper'] += $field_storage_form;
     }