When you start a new world on flatland. Sometimes it creates a big block of a standard world. And sometimes when you Search you find it too. This happends very rarely
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No, Jar_
kumasasa
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/finding-minecraft-data-folder]) here.
Did you have a world with the same name before creating this one?