I’m not sure this should be considered a bug or rather functionality that could be improved, but if a topic is recategorized from Category A (which I’m watching/tracking/muting) to Category B (which I’m not watching/tracking/muting), I’ll still be watching/tracking/muting the topic.
In the opposite scenario (topic changing from Category B to A) I’ll then not be watching/tracking/muting the topic.
This can make for unexpected notification behavior. The simple fix is to check for user category notification preferences when changing topic categories. There could also be a check if the user manually adjusted their notifications for the topic (or automatic tracking kicked in), but I don’t know if that’s possible or desired.