Put the summary of the bug you're having here
What I expected to happen was...:
Generate the terrain usually
What actually happened was...:
A never ending "Loading world" screen and a crash report being created.
Steps to Reproduce:
1. Click on "Create New World"
2. Select the world type "Superflat"
3. Customize using the "Water World" preset
4. Atempt to create this world
Thank you for your report!
However, this issue has been temporarily closed as a Awaiting Response.
We do not have enough information to find the cause of this issue.
In case of a crash please add the file
[.minecraft/launcher_log.txt|http://hopper.minecraft.net/help/finding-minecraft-data-folder]
to this ticket.If there is no crash log, please follow that guide.
Once attached, the report will be reopened automatically.
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