In this issue was added some css:
https://www.drupal.org/project/drupal/issues/3445993 π Provide a NavigationLinkBlock Plugin and use Help as an usage example Needs review
https://git.drupalcode.org/project/drupal/-/merge_requests/8011#note_316513
1. Remove unnecessary cascade.
2. Probably remove that last-of-type selector and add it to padding-bottom.