Upon loading a world, and almost immediately entering the Nether through /setblock, overworld terrain generation will occur in the Nether. Water, sand, stone, and grass, as well as other blocks, will begin to erase the Nether terrain and generate in its place.
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Please force a crash by pressing F3 + C for 10 seconds while in-game and attach the crash report (
[minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/guides/finding-minecraft-data-folder]
) here.Once attached, the report will be reopened automatically.
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