I will be working on a map in-game, but when I enter MCedit, some chunks have been randomly deleted or generated vanilla Minecraft terrain. Much like what happened to Vechs here:
I see no reason for this to be occurring, as I have been doing nothing differently... This same bug occurs in the End.
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Duplicate of MC-2548, please use the search function to see if your bug has already been submitted. Currently over 50% of tickets are being closed as duplicate.