Pathologic was missing because of a .git folder inside.

[yaffs-website] / web / modules / contrib / diff / diff.links.task.yml

diff.general_settings:
  route_name: diff.general_settings
  base_route: diff.general_settings
  title: Settings

diff.fields_list:
  route_name: diff.fields_list
  base_route: diff.general_settings
  title: Fields