I think this may be a bug on Roblox, as other developer have experienced the same thing and I’ve went through my code tons of times.
Basically, users with a blocked avatar (as shown in the image below) will experience bugs that regular users won’t. From what I’ve seen, some functions don’t work for them.
I’ve printed the players information and it all seems to be the same (player.Name, player.UserId, etc.). I have no further information than that unfortunately.