Attached a picture taken today, in 1.15.2
"Probably" is a very unprofessional way of handling an open case. And no they didn't. We've had them spawn even with all the shulkers boxes removed. They don't move when on double carpet.
Right, thanks for clarifying. That's probably what it is. There is indeed such a datapack installed.
Just optifine.
Still affects versions up to 1.16.3