If you sit on a boat.And the boat is on the blue ice and make it whirl will have some bug.

 1.use this command 

/fill ~10 ~ ~10 ~-10 ~ ~-10 minecraft:blue_ice

2.put a boat on the ice

3.whirl the boat

4.Use L-Shift to leave boat

You can see the boat is not whirl.But you sit on it again the boat will whirl again