OMG! THANK YOU! This has been driving me nuts! Thought I was losing my mind. I have two ATVs, one HD and one 4K. One is in a stereo set up and the other in an Atmos theatre set up. Only the stereo setup was affected. So after hours of troubleshooting, switching out HDMI cables, network cables, wifi settings, reset TV to factory settings, reset ATV, changing resolutions, HDMI settings, etc., I decide to swap the ATVs. I pulled the ATV out of the theatre setup and put a n the stereo room and vice versa and to my utter astonishment, the bloody thing still didn’t work in the stereo room but the one that wasn’t working was now working correctly in the theatre room. Been pulling my hair out until I found this thread. I had isolated it to the ATV once I swapped the ATV rooms, was the only variable at that point but I would never have guessed or thought to change the output to stereo. How incredibly random of a glitch to affect play/pause playback.
Thanks again!
Apple... take note and please address in a software update!