Boat rows on autopilot (when trying to mount a rideable mob whilst rowing the boat).

Steps to reproduce:

1. Try to get a horse/pig (any mob you can ride) on the boat.

2. Row the boat, while at the same time, try to mount on said rideable mob.

3. What should happen is that you will be kicked off the boat, and said boat will go on autopilot in the direction it's facing with the mob on-board.