Levers Pop Off Non-Solid Blocks

When placing a lever on a non-solid block it can be placed on (hopper, upside-down stair, upside-down half-slab, etc.), it will appear normal. However, when updating the lever by turning it on or giving it a block update, it will pop off as an item.

I think this is a leftover bug that was caused when attempting to fix the torch pop-off bug from the previous snapshot.