I updated this week to the 12.01 S2 patch and things went to hell. TV sound only works sometimes. Neither LG remote nor AppleTV remote can control the TV volume anymore - previously both worked fine.
Sonos S2 app tells me it can’t find the ARC connection between Arc and TV, but it’s there and I can hear sound, and yet app keeps telling me to connect it and enable ARC output of TV lol. Music is totally normal. Everything was fine until I updated the latest version of the software yesterday.
Further Sonos’ instructions to setting up LG remote and AppleTV remotes are both outdated and reflect neither (1) 2020 CX line of LG OLED nor (2) S2 App workflow.