The bug:

Boats move to a side when placed on any type of ice while the player's yaw degrees is 0, 90, 180, etc. 

Steps to reproduce:

1. Place a boat on any type of ice while your character has the yaw of 0 degrees, 90 degrees or 180 degrees for example. (Use F3 to check your yaw degrees)
2. Notice how the boat moves to one side despite your yaw angle.