Unlocking your phone using black coloured face mask
It work almost all the time.
unlock the phone only, wearing black coloured face mask.
the Face ID can detect and unlock ..
but other Face ID cannot detect.
I wonder why
iPhone 12 Pro Max, iOS 14
If you have a Watch, read/watch this:
Unlock your iPhone with Apple Watch when you're wearing a face mask
https://support.apple.com/en-us/HT212208
similar as a video: