What I expected to happen was that I would view the ice normally on a boat.

What actually happened was that the ice started glitching out and the shadows were messy.

Steps to Reproduce:
1. Open a new world and find some ice on water, or create it.
2. Get in a boat (I used Oak type).
3. Switch to 3rd person view and face the ice.
4. Vwalla! You have messy, glitched up shadows.