So my world just crashes when i load it up, it's fine in 1.12.2, but crashes in 18w10d. It might have something to do with the place i start in:
I have a Iron titan (iron farm with 32 villages on a very tight space). Next to that i have a timer which shoots out an item every few seconds into a nether portal. The theory was that this contraption would keep the chunks loaded and so that the 32 villages wouldn't merge into one big village. The iron titan and this timer are at the spawn chunks. I hope you have the same problems as I do.
I had other problems with that world, but the fact that I can't load a single player world in a snapshot is a bug and should be fixed.
My world: http://www.mediafire.com/file/9s0obddh7rdzgkd/New%20World%20snapshot%203.zip