Refs are not cleaned up for deleted merge requests

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Merge requests have refs associated with them, e.g. refs/merge-requests/10/head. These refs are cleaned up after two weeks for merged merge requests. (This cleanup may depend on a configuration setting.)

When a merge request is deleted, I also expect the ref to be removed, either immediately upon deletion or after the cleanup period of two weeks. However, the ref remains.

In a test project, I created two branches with changes and made merge requests for each. I merged MR 9 and deleted MR 10. Then I checked with git ls-remote which refs are available.

Immediately after merging/deleting, it shows that refs for both merge requests still exist:

$ git ls-remote
245034c470e7c687a1247fd00bbcdac435454ea7	HEAD
...
9eb2937265ebf71b05992ac6d1fb273c5a8be019	refs/merge-requests/10/head
148d5b84f8f472b3100aeb0e6778b8b8cff0d7e7	refs/merge-requests/10/merge
92a4040c465a87fe675c5bceac88d1ff0d84033c	refs/merge-requests/9/head
979de050a30f7ec11233da2f981435e01784084f	refs/merge-requests/9/merge

After two weeks, the merged merge request ref has been removed, but the deleted merge request ref still exists:

$ git ls-remote
b13dc0476ee6a6bbf66462e10e5b76173c39a512	HEAD
...
9eb2937265ebf71b05992ac6d1fb273c5a8be019	refs/merge-requests/10/head
148d5b84f8f472b3100aeb0e6778b8b8cff0d7e7	refs/merge-requests/10/merge

I would expect the ref for the deleted merge request to also have been removed by now. Perhaps immediately upon deletion?