For people like me who use several reverb buses to receive instruments' signal with aux-send or insert-send this might be seen as a bug. Fading the instrument down would still leave it's reverberated signal in the mix, e.g. in Master in.
The best solution would be a toggle "pre/post fader" in aux-send and insert-send. But a hardcoded solution "post fader" would be fine as well.