Void start platform

The stone platform is a 33×33 square of stone with a single block of cobblestone in the center. It is created at the world spawn of a Superflat world on initial generation if  biome and   are set in the preset code.

Generation
The stone platform spans from block positions (-8,3,-8) to (24,3,24), and thus the player spawns at Y=4. This structure is most easily accessible through "The Void" preset but it still generates if different layers are specified, even if it gets engulfed.

Trivia

 * The player first spawns right above the platform, even if there are layers of full opaque blocks above it, causing suffocation.