The ARC works amazingly on my setup. It still allows for Dolby Digital/DTS/etc. to be used. It just passes it along and my receiver is doing the decoding. It also has never messed up like with other setups. My TV is nothing special (2013-ish Vizio) and neither is my receiver (Marantz SR5005). I don’t have another TV to try this with but I suppose I can go try everything on my friend’s B7 OLED and see if it still does it. That may take a couple of weeks, however. My parents have an old HD WEGA TV as well that I could probably try on Thanksgiving when we’ll be visiting.
I tried it connected just to the TV and using the TV’s speakers. Still happens.