boats kick player out of them when submerged

boats will dismount the player when submerging or hitting a wall of water (boat elevators and even flowing canals if the boat dips down deep enough).

seems like boats are getting stuck with the horse mechanics (lack of lateral movement and dismounting in water) instead of horses getting their own. if this is an intended change it seems unneeded and makes boats hardly worth making anymore and ruins any kind of boat transportation system.