This is happening quite frequently. Music is playing but somehow the watch does not recognise this. I can, however, Pause/Start the music. And when backing out of the music control widget, for a 10th of a second you can actually see the interface you’re supposed to see. So clearly a software issue. In the video below, I’ve slowed down the brief moment where you can actually see the correct interface. Only solution is to reboot my phone. I have a Marq Expedition running 3.40 and an iPhone XR running latest iOS.