Bamboo Raft and Raft with Chest models float above ground

I also found this bug when I was trying to build scroll-shelves using bamboo raft.

Well, I think the reason is that bamboo rafts are basically the same as boats, so the code for boats is directly copied to rafts with little modifying. As a result, the boundary box of rafts is the same as boats, but the visual model of rafts is 8 pixels high, whereas boat looks 9 pixels high (same as the boundary box).

Actually, if change the hight of boundary box from 9 pixels to 8, the problem is solved perfectly