Reminder to set a profile photo even though one is already set

I just received the “Reminder: you're not shown on the front page because you haven't set a profile photo” email with instructions on uploading a profile photo within 90 days, however I already have one set?

Also, when trying to upload a new photo you get a message saying something went wrong on the server, as seen in the different bug report that’s open here. That’s not the case — the server responds with a 403, as Cloudflare blocks the request (ray ID 98479c7139fafcd6 for example). It seems that some kind of security rule is preventing upload requests from going through?