oh yeah another thing
Did a little tweaking and messing around with the glitch,
It freezes the icons, so it doesn't show how much stamina you have, your coins, or your items, so it's a blind guess. only the bottom ones though, the test counter and teacher icons still work, and also the heart container still works, which I thought was broken.
The Dopelganger also acts as a separate hitbox, like you could be at one end of the map and the Dopelganger would be at the start, it doesn't matter what teacher hits it, Circle, Bloomie, or Thavel, you still take damage and you still fail.
it's also a kind of "permanent" thing, what I mean by that is that if you were to leave a gamemode and start another, the dopleganger would still be there (haven't tried going back into a co-op with the glitch yet, nor tried Princess Disgrace with it)
the copy is pushable with Bsoda
idk why I did post all this, just seeing if you needed the info if it could come in any use.