Affects Version/s: Minecraft 15w40b
Fix Version/s: None
Environment:Java 1.8.0_25 64 bits.
3Go RAM allocated.
8x Intel Core i7-2630QM @ 2.00Ghz
Nvidia GeForce GT 540M/PCIe/SSE2
Windows 10 Home 64bits
Spawn platform in flat world with "The Void" preset don't generate properly.
Affected chunks seems to be corrupted.
I've tried to reproduce that, and issue doesn't reappeared.