Superflat Skybox is placed too high up

The skybox in superflat worlds (or possibly all worlds) is awkwardly placed thanks to the new height changes. the transition from sky color to the black void usually reserved below bedrock is now very clearly visible if the player is hovering just a bit above land.

This makes building on superflat a bit frustrating at the moment and can be temporarily fixed by offsetting the height of superflat worlds up 64 blocks.