commits not showing in issue when the issue has been closed

If an issue has been closed, one can still commit to it using "refs #..."

Those commits are correctly added to the issue.

But if instead of "refs" one uses "closes" or "fixes" for an already closed issue, the commits are not added to the issue.

See the little test project I have created for this, there's one closed issue there:

https://gitlab.com/udotirol/the-test-project

One might say that is is correct not to be able to commit to a closed issue, but then the push should be rejected.