I've recently noticed (around 3 days ago) that my iPhone is able to unlock my phone even with a face mask on, covering the nose and mouth. It even works for Apple Pay!
It's not 100% reliable however, it works better the further down the mask is on the nose bridge.
I have not done anything since I registered the face ID back in November 2020.
I'm using an iPhone 12 Pro running iOS 14.4
Anyone else experiencing this "bug" or "feature"?