What I expected to happen was...:
i didnt expect the game to crash

What actually happened was...:
I Had started playing the latest snapshot, and so i wanted to try the new superflat present type named "void" i entered it, flew under the stone structure, flew close to above, pressed F3 and the game crashed

Steps to Reproduce:
1. Create New flatworld with the new void present type
2. fly under the flat stone structure
3. press F3