Well, WearOS is easier to sideload and do things without PC...I did everything you suggested, and still same issue. So it appears hardware.
This issue only started when I took the newest R820XXU1FVH4 update in October.
Odd that we can test most sensors on the watch but not this one.
I am looking at the newer watches the 3 or 4, not sure if I want to stay with tizen or wear os.
I can't afford the 5....yet...
Suggestions?
That's all what I can say...
I own watch3 (kept it for the shm mod support) and watch4...