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:
at byo.a(SourceFile:306)
To reproduce:
Start 17w15a
Create a new world, more world options, switch to Superflat, press customize.
Logs included.
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However, this issue has been closed as a Duplicate of MC-115802.
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