Asset building breaks the site
Upon upgrade of a Drupal 8 site to CiviCRM 5.30.1 from 5.29.something, the site broke completely with this php error in the drupal watchdog:
Civi\Core\Exception\UnknownAssetException: Unrecognized asset name: crm-menubar.css in Civi\Core\AssetBuilder->render() (line 217 of /var/www/drupal/vendor/civicrm/civicrm-core/Civi/Core/AssetBuilder.php).
Missing assets shouldn't break the site.
To upload designs, you'll need to enable LFS and have admin enable hashed storage. More information