When you are sailing in a boat and then you want to leave, sometimes the boat disappears and you can not move until you destroy it. I think this happens from 1.13.
In version 1.14, when you are sailing in a boat, in an unloaded area, it moves down and when it is loaded, the ship disappears and you suffocate with the blocks. When reappearing and go to the place where it happened, we will find 3 blocks of wood and two sticks (approximately).