You mean donuts don't come back. :P "Does" is only for third-person singular nouns in present tense, and "donuts" is plural.
I will say, I'm having trouble seeing how players can get stuck in multiplayer without getting stuck in that same spot in single player, but I guess I'll take your word for it.
Anyway, here's another that I noticed a few days ago or so: the diagonal whip has a much-thinner hitbox than the horizontal whip. This is easiest to notice while trying to clear away the green skeletons' fog from a standstill, which is significantly harder to do diagonally:
You can tell by the skeleton's throwing animation that the top image isn't the fog disappearing on its own because of when those animations happen relative to each other compared to when they happen in the bottom image, where the fog *does* disappear on its own.