Moderation mailbox not accessible

When we try to access our moderation mailbox (https://www.our-forum.com/u/username/messages/group/moderators) only an error message appears:

Error
Something has gone wrong.

Nothing more. However, the call works via another link: https://www.our-forum.com/g/Moderatoren/messages/inbox

We use the version 3.1.0.beta5.

Any hints or a way to isolate the problem?

I think it is the bug described here. Seems it will be fixed soon

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