When creating a new world and setting the generation to flat void world and changing the biome from the_void to another one, creates a world without a stone platform.
When creating a new world and setting the generation to flat void world and changing the biome from the_void to another one, creates a world without a stone platform.
The platform is considered a biome feature, much like trees, it isn't defined in the preset.
Perhaps the platform should be made to generate if the overworld is set to superflat with no non-air layers instead.