Can't generate impostors for one of my avatars. I get this message when I try. "Oh no! We tried, but we could not generate an impostor version of the avatar "ttftmk2-hoodie"."

I have tried again for this one. But nothing really changes. Still works for all my other avatars. No obvious differences from other avatars that works for me.

Avatar: avtr_e08d3526-c73b-4947-ae1a-331fe55e9e07