Upon saving , quitting, and reloading the boat was again floating above lava. However, it was being held up by another block.
So, when you push boats onto lava on a diagonal, the boat floats in lava. When you decide to get in it, it floats to the bottom and doesn't break. It's hitbox is such that you can stand on it and receive damage which is lava damage, but not catch fire. The image with the lapiz blocks show where you cannot place blocks because there is a boat in the way. Kinda funny because boats are 2x2. Also, I was able to get the boat to float in land by sitting in it. It's hitbox is still above the ground. My y-axis was hoveering between 4.3 and 4.5 while standing on the hitbox.
I would think that the iron doors are being placed in the world facing the wrong direction.
Duplicate of MC-11193