[Arrei]

Carts aren't the only thing having issues, I've had trouble trying to have my post-1.9 design glass elevator work properly because the item entities just don't behave consistently. Hopper carts are restricted as they are because they are the laggiest entity in the game. They are allowed to exist on the server only under tight regulation on their numbers, and because there are circumstances where they would cause less lag than alternative options. Smelters and breweries are not one of those circumstances.