Completely broke 5.1 audio. Only getting Multi-In audio codec on my Denon 3800 since the update, unless I force Dolby 5.1 in the audio settings. But, by doing so I lose the ability to have the Apple TV auto detect Dolby Atmos. Current setup is ATV 2nd Gen > Denon 3800 > LG C3. I’ve reported the issue to Apple, they agree something is wrong but cannot resolve it without a software fix.
Ive tested this with a number of movies on HBO Max, Netflix, Hulu, and Prime Video. My Firecube G3 and Shield Pro are outputting Dolby Surround, but the Apple TV outputs Multi-In on the same movies. The odd thing is I can still achieve Dolby Surround if I turn “audio descriptions” on. I also get Dolby Surround on movie trailers. The second I turn a movie on, Dolby Surround is gone.
Never do the tv os betas, if your iPad or iPhone screws up you can work around it. If your tv screws up the whole family is screwed.