Remove a subgroup that has a repo with the path '..' — two dots

Steps to reproduce

I have created a subgroup and a repo in it. Then I have changed this repo's path to .. — two dots. And now I have problems accessing this repo and managing it at all, and I can't rename or delete it. Also, I have the same problems with the subgroup and with the parent group. Also, the main page of the site has been cached somewhere and I can't update it. Clearing the runner's cache doesn't help.

Example Project

https://gitlab.com/group1989

What is the current bug behavior?

I cannot rename or delete a project, as well as a subgroup and a group.

What is the expected correct behavior?

.. — two dots should be on the list of reserved_names.

And I need to remove these subgroups somehow.

Output of checks

This bug happens on GitLab.com