Cannot delete comments and downtimes

CMK version: Managed Services Edition 2.1.0p23
OS version: Ubuntu 22.04

Error message: Cannot delete comments and downtimes

I have some service downtimes that I no longer need. Unfortunately, I can’t delete them via CheckMK WATO. The same goes for some old comments that were set when acknowledging problems. The problem is long gone, but the comments are still there, and they cannot be deleted.

Is there any other way than using WATO to remove the downtimes and comments?
Is this a known bug that is already being worked on or for which there is a solution?

When removing downtimes or comments, no error message appears but just the normal queries.
image

And confirmation that the commands have been executed.
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If you go back to the overview, however, everyone is still there.

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