Upon loading a world, which mind you has some schematics pasted in, but the launcher remains unmodified, the world crashes after going to a certain area that is broken or some such thing.

I simply expected the chunks to load.

After going to a unloaded region of the map, it crashes. I can go to loaded areas of the stock world and pasted in regions, but not a certain part of them.

To Reproduce:
1.Open launcher and start game as normal
2.Load world
3.Fly to region that has not been loaded
4.Unexpected crash