I've just upgraded my Pixel 4 (running DND Sync perfectly) to a Zenfone 9 and have set it all up. GW is running One UI 5.0.
Aside from having to use adb pair now it all was fine. Everything works nicely from phone to watch, but the watch is not syncing back to the phone. I have enabled notification access for the app on the phone (which didn't have an option for restricted settings as noted in #7 )