I have been finding that playback of whatever I have been listening to (Audible or Spotify generally) will resume after I put the Air 3 back in their case. This happens if I pause using the tap controls, if I pause using the app on my phone, or if I just put them straight in the case without pausing.
This is quite annoying as either it means that whatever I was listening to starts blaring out of my pocket if the volume is up on my phone, or if it is muted, it plays for some hours using phone battery and losing my place in whatever I had been listening to.