| Q | A | ---------------- | ----- | Bug report? | yes | Feature request? | no | BC Break report? | no | RFC? | yes | Symfony version | 4.0.8 Bootstrap 4 layout does not render form parent errors correctly after switching to `<span>` *d-block* class is missing after alert-danger Commit: 5dcaaadb5e8c01148b67d009c95a5118849f9a55 ```html <span class="{% if form is not rootform %}invalid-feedback d-block{% else %}alert alert-danger{% endif %}"> ```