Bug description:
If make a world and select world plate, and select the preset void, you can place sand blocks and will not have the gravity.
Steps to reproduce the issue
Join a world made with the void preset
Grab sand blocks
Destroy some stone blocks
and place the sand blocks
Expected result
when placing blocks of sand in the pavement made of stone would fall the blocks of sand.
Actual result
When placing blocks of sand in the pavement made of stone would not fall the blocks of sand.
Works as intended - In a regular world placing and liquid or a block with gravity at -64 (this is the same level as the void preset) will make the block/liquid float. This is because this is the lowest part of the world a block can be present as the minimum level a player can place blocks is at -64