Sorry my response is late.
I posted this because I’ve been wearing mask for months becuase of the coronavirus and it never worked with mask on. And it’s working now magically after I updated!
Some note:
1. I think it’s not passing through my mask because it hasn’t work before update and it doesn’t work on low angle.
2. It doesn’t work on low angle. It works on at least horizontal level, same as my eyes’.
3. I wear my mask, of course, fully with nose and mouth disclosed. Like this:
https://images.app.goo.gl/9HLt57xvAQjWkh8E7
4. I think it’s great now(it works even with my mask on! I don’t have to fill in passcode every time). But my concern is that I am not notified of this. Apple didn’t tell about this on their patch note! So I think it’s probably bug.