Affects Version/s: Minecraft 17w15a
Fix Version/s: None
Windows 10 x64
Java 8 Update 101
Tested using Minecraft Launcher and MultiMC, both fail.
When I create a new world, switch the type to superflat and click customize, the game turns to the dirt background for less than a second then crashes. Nothing is left in the launcher output log. However MultiMC spews a bunch of:
Create a new world, more world options, switch to Superflat, press customize.