Just letting people know that the following bug reported in late January hasn't yet been fixed in the just published 18.22, and it's bound to affect a lot of winter sports enthusiasts:
If you wear your watch over the sleeve while doing an activity (and use a HRM strap to record your HR), wrist gestures to wake up the screen don't work.
As a temporary workaround you can disable wrist HR while doing the activity. Let's hope Garmin fixes this soon in another update, the bug/regression has been acknowledged and a ticket has been created (Garmin-Sierra, it would be nice to hear if there's any update on this).
(BTW, this seems to be a good example of how fixing something may break something else. People have been complaining on these forums that when you stop your activity while wearing a HR strap, it takes a moment for the wrist HR to lock onto your HR again and give correct results. Now Garmin has improved this by keeping the wrist HR on while wearing a HR strap. But that has caused the watch to think it's not being worn when it doesn't detect optical HR while worn over the sleeve...)