When did webp profile pictures get disabled?

Until today I had an animated profile picture, changed it for owl appreciation day and now I it won't let me re-use the profile picture I had?

It's even there on the server @ https://hexbear.net/pictrs/image/49d5c974-6784-446d-af10-5c369c7781c7.webp?format=webp

But if I try to add it to my profile picture again, it fails.

If I had been warned about this I would not have ever changed it. Give it back :(

EDIT: Solution - https://hexbear.net/comment/3855898