When I boat along packed ice and my boat is stopped by a closed fence gate, sometimes (but not always) the boat will glitch through the closed gate and I will become stuck and the camera will shake. I can move while I am stuck, but it is very slow and the camera keeps shaking. The best way I have found to get out of this situation is to break the boat by clicking on its apparent position on the far side of the fence gate. Once I successfully break the boat its item drops on the near side of the fence gate.

Attached is a picture of the packed ice transportation system I use to travel. This glitch has happened on two different survival servers.