I noticed a bug that when playing with other players, when they log out, the plumes of smoke remain at thier last nown position, complete with the pollution effect.

Likely caused by the player/ character entity still existing at that location. Fixable using a suitable check.
I haven't tested much in MP so there are likely other quirks.

I haven't noticed anything else other than this. Forgot to actually report it when i first noticed it because I kinda used it as a way to know certain player log out location to prepare them random surprises when they log back in :P