Emma B

Here's a mediafire link to the world I've referenced previously, one location in specific that causes game/server crash (depending on whether it is run in singleplayer or on a server) is in the world at [1049, 72, -3238]. I've found that deleting the region data for this area, and reloading in 1.13-pre8 prevents the crash.

I cannot attach my world as it is too large of a file, but it was first generated in 18w11a, on the seed -2941945307275246814.
Generating a world with the same seed on 1.13-pre8 yields the same world, except that it does not crash at the particular coordinates that the 18w11a world does.