I would like to ask for a feature:
When answering, users might not be aware that mentions will not notify recipients if they are not part of the groups that can see all topics.
Would it be possible to add the usual warning in this case (User XY will not be notified since he is not able to see the topics)?
In our case, it would also help to show the needed membership to participate, but I think this is not a general expectation.