Why is there "[username name]s' user avatar" on this user's avatar? I thought there would be either an avatar or the default avatar.
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It’s the 'alternate text' because the avatar won't load. Some digging (trying to open the image on its own gives this error
Resolving this error is out of the scope of this answer (that's to say that Facebook avatars are broken is a different issue + I have no idea how to solve it, nor can I actually suggest a fix).
It seems that some user's profile pictures get loaded from Facebook, because they connect their SE account to their Facebook Account.
I currently have a browser extension (DuckDuckGo Privacy Essentials), which is designed to block trackers from Facebook. It appears that for some reason, it is registering a false positive, perhaps a change to where the picture is getting fetched from (a lot of these extensions block stuff that matches a certain URL pattern).
Because the image is blocked, an alternative (the text you see) is displayed.
I can tell this, because in chrome DevTools, it reports ERR_BLOCKED_BY_CLIENT (something on your computer doesn't want the picture to load)
Test - I can see the picture properly on a computer without said extension, so this theory seems to be correct (for me).
I can think of lots of extensions which might trigger this, maybe try to disable them: