Pathologic was missing because of a .git folder inside.

[yaffs-website] / web / modules / contrib / media_entity / media_entity.routing.yml

entity.media.multiple_delete_confirm:
  path: '/admin/content/media/delete'
  defaults:
    _form: '\Drupal\media_entity\Form\DeleteMultiple'
  requirements:
    _permission: 'delete any media'

entity.media_bundle.collection:
  path: '/admin/structure/media'
  defaults:
    _entity_list: 'media_bundle'
    _title: 'Media bundles'
  requirements:
    _permission: 'administer media bundles'