Finally, it is here!
Apple fixes iPhone’s faceid to work on faces with #mask. During the pandemic it was a pain to type a PIN everytime to unlock the phone while you were out and wearing a facemask. The new fix with iOS 15.4 doesn’t require an Apple Watch, owning one was a requirement in earlier versions.
In the pictures here, notice my mask and the unlock icon (highlighted), taken with #iPhone12 Pro.