Crash when loading copy of existing 1.10 world. Removed all resource packs and mods

Put the summary of the bug you're having here

What I expected to happen was...:
Load existing world in new snapshot
What actually happened was...:
Indicated loading, then crashed.
It does work with a newly created world. I use faithful32 in my release version.
Steps to Reproduce:
Selected beta profile, has worked before this verison
Loaded copy of existing 1.10 world
Indicated it was loading
Crashed