Chunk error

Put the summary of the bug you're having here I finished building a draw bridge and I wanted to relax in the bathroom maybe take a shower when I saw this giant hole in the ground that I couldn't put blocks in or walk out of, I could fly out though. Also it destroyed part of my bathroom.

What I expected to happen was...: nothing to be different
Describe what you thought should happen here

What actually happened was...: there was a huge hole
Describe what happened here

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ... I don't know I had created a lava mote and a drawbridge and that is when I noticed it.
3. ...