CoVID has really highlighted this phenomenon for me. Recognizing people masked and unmasked. I have also had the issue of recognizing people based upon environmental context,...know people at work (wearing scrubs, mask, etc) , but not recognize them outside of work in street clothes (pre and post CoVID). I also have a common phenomenon where the parents of a baby that I took care of will recognize me, call me by name, talk to me about how their child is doing,...and I am thinking to myself, "I've never seen you before." and I have to act like I know them. Really weird feeling,...and I kind of feel like crap because I was a person of meaning in their life,...and I don't remember them at all.
Off topic a bit: It is interesting, working with babies though. At the children's hospital we worry about babies and their neurodevelopment while interacting with them when wearing a mask,...as they are just learning about reading faces,...and yet, we find that simply raising the eyebrows will often elicit a smile from most babies. Seems that wearing the mask actually, in some cases, forces the baby to look at the eyes. Quite interesting.