Boats turn invisible after unloading chunks.

What I expected to happen was...:
I expected my boat to be there. 

What actually happened was...:
It wasn't there but was still blocking my ability to enter the water, I would stand on nothing and shake rapidly, trying to place blocks in the area it was in merely caused the blocks to disappear from all existence.

This happened in another instance when a drowned was in another boat, this time the drowned stood on top of the water as if it was in a boat which couldn't be interacted with or seen.

Steps to Reproduce:
Not sure exactly, but have a boat, die or unload the chunks. Could be other factors, still figuring it out.