Error 500 while removing fork relationship of a project

I have a project forked from the original boilerplate

It is forked to other project and the original fork relationship was removed some time ago.

I have now forked my project to a new project.

Everything works fine except that I cannot break the fork relationship - I get Error 500. Tried multiple times with no luck

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Earlier raised issue with GitLab : Error 500 while removing fork relationship of a project (#419291) · Issues · GitLab.org / GitLab · GitLab
But they suggested to contact support team for further troubleshooting using tools.