Removing Project fails with error message

Description of the problem

Removing Project fails with the message:

This project was scheduled for deletion, but failed with the following message: Failed to remove project repository. Please try again or contact administrator.

Which Group/Project (with full path) is experiencing the issue?

https://gitlab.com/aur-archlinux/binfmt-support

https://gitlab.com/aur-archlinux/swift-language

Approximate date/time when the error occurred.

Tried it three times. Two times more than a week ago and one a few minutes ago

Describe what you were doing right before the issue occurred.

I was at https://gitlab.com/aur-archlinux/swift-language/edit using the Remove project button entering the correct name of the project. After entering the name I got redirected to my projects as usual. Scrolling through the list, however, revealed that my project was still there and accessible showing the upper message.