Issue #3450375: Prevent repeated form errors on child inline items from parent form element

Closes #3450375

core/lib/Drupal/Core/Form/FormErrorHandler.php

@@ -163,7 +163,7 @@ protected function setElementErrorsFromFormState(array &$form, FormStateInterfac
     }
 
     // Store the errors for this element on the element directly.
-    $elements['#errors'] = $form_state->getError($elements);
+    $elements['#errors'] = $form_state->getError($elements, FALSE);
   }
 
 }