This is pretty much what is already possible with NPCs and attachplayertoobj. It is also pretty ****ty because you could stand next to the bridge and instead of walking onto it, throw a bush right through it into the water.
Maybe when the Bush enters the Bridge it should also change it's layer?
Maybe when the Bush enters the Bridge it should also change it's layer?
I think the entire plateau-ish thing leading up to the bridge needs to be on the upper layer already, but I have no idea how to work that into our tile system.