I created a superflat world with just one layer of air using the superflat preset 3;air;1; and I can't move at all.I used 1.8 to create the world and I could move perfectly.In 15w34d,I can also see "holograms" of blocks at different areas which are non-existent.When I move towards these "holograms",the sky would darken,which happens when players are falling into the void.
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I ran into the same bug trying to create a superflat world with only air in snapshot 15w34d.
Presets I tried:
3;minecraft:air;1
3;0;1
Both create an air-only world, but you are unable to move outside of teleporting.
While in this immobile world, I used /setblock ~ ~ ~ minecraft:stone to create a block at my legs. It created the block but didn't push me out of it like in 1.8. I stayed standing within the block, unable to move.
PencilSharpener
Empty chunks are just entirely broken in this snapshot. They seem to behave almost identically to how chunk errors worked in 1.8.