Sure.
The TV has a Sonos ARC connected to HDMI2 using the sonos supplied HDMI cable. It's using eARC and all HDMI ports have been configured to HDMI 2.1.
HDMI 3 has the latest Apple TV 4K connected using a HDMI 2.1 certified cable.
If I use any of the built in apps of the TV, I face zero issues. Everything works perfectly as it should.
If I use the ATV4K, any non 5.1 content, or Atmos content plays perfectly in sync. However, any regular 5.1 content has major issues. It works in sync for a while, but will suddenly lose sync completely and the only way to fix it is to reboot the TV.
The sound output settings for the TV are set to passthrough.