When my previous bug happens, and you create a new world with the same name, Minecraft tries to generate both worlds at the same time, resulting in random alternating chunks from both worlds.
MC-9222
World Generation
Resolved
Duplicate
0
Garrett Spence
(Unassigned)
Unconfirmed
Minecraft 1.4.6
Retrieved
28th Duplicate of MC-315, please use the search function to see if your bug has already been submitted. Currently over 51% of tickets are being closed as duplicate.