Let's say there is eZ Platform site on Platform.sh. Own domain is used to access the admin. So site has following domains:
Front-end (https://project.com) is served by Varnish, but admin is not:
When you edit/publish some content in admin UI (https://admin.project.com), it is expected that its Varnish cache will be cleared. But actually, the Varnish cache is not cleared.