@Corjan-Meijerink, Indeed, the 1 second pause did seem to help, but it is just not enough, for my specific case I mean. You absolutely cannot introduce a longer pause everyone not having this problem My theory, not being held back by any knowledge, is that some AA devices simply do not honour the "wants priority" command, but listen to audio (voice) itself and decide (too late) to duck for themselves.
the behavior differs depending on if you are listening to the car radio or to spotify.
Yes, but that is quite logical. When playing spotify (or anything else) from your phone, the media channel is continuously open. The phone ducks spotify, and not AA.