Pathologic was missing because of a .git folder inside.

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

media_type:
  label: 'Media type'
  plugin_manager_service_id: plugin.manager.media_entity.type
  plugin_definition_decorator_class: \Drupal\plugin\PluginDefinition\ArrayPluginDefinitionDecorator
  plugin_configuration_schema_id: media_entity.bundle.type.[plugin_id]