Steps to Reproduce
Click Single Player
Click Create New World
Go under More World Options
Select Superflat under World Type
Click Customize
The game crashes
Environment
Latest launcher, Windows 10 Home 64 bit
MC-116268
Clicking on the Customize button in a superflat world instantly crashes the game
Resolved
Duplicate
0
Thank you for your report!
However, this issue is a duplicate of MC-115802.
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