I think I have this.
It’s hard for me to communicate online to my coworkers who do not have a profile picture. And then when I do meet them in person, I don’t recognise them straight away the next time I pass by them (or worse, in a social function).
The ways I remember people by are their mannerisms and everything else about them, except for their physical appearance. But because people change styles and environments change, it’s hard to instantly recognise them on the third or more times I see them.
Good note on the instances removing kbin communities (is this defederation?), my instance in Sync for Lemmy is showing the links you shared as a website and not a normal federated community.