I can't remove myself from my previous organisation's gitlab projects

Summary

I can't remove myself from groups or projects. I have permissions for many projects in the private repositories of https://gitlab.com/touchstar/, but I've tried to remove myself, and so have the current owners of the groups and projects.

Steps to reproduce

I have no idea. Before I left the compay, I promoted other members to Owner, then removed myself from various groups and subgroups.

Example Project

https://gitlab.com/touchstar/

What is the current bug behavior?

I can't remove myself.

What is the expected correct behavior?

I should see a button which lets me remove myself from the group(s).

Relevant logs and/or screenshots

https://gitlab.com/groups/touchstar/os/android/-/group_members:

(How one can reproduce the issue - this is very important)

https://gitlab.com/touchstar/os/android/device_touchstar/project_members:

(Paste any relevant logs - please use code blocks (```) to format console output, logs, and code as it's very hard to read otherwise.)

Output of checks

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Results of GitLab environment info

Expand for output related to GitLab environment info

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sudo gitlab-rake gitlab:env:info)
(For installations from source run and paste the output of:
sudo -u git -H bundle exec rake gitlab:env:info RAILS_ENV=production)

Results of GitLab application Check

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(For installations with omnibus-gitlab package run and paste the output of:
sudo gitlab-rake gitlab:check SANITIZE=true)
(For installations from source run and paste the output of:
sudo -u git -H bundle exec rake gitlab:check RAILS_ENV=production SANITIZE=true)
(we will only investigate if the tests are passing)

Possible fixes

(If you can, link to the line of code that might be responsible for the problem)