When placing a lever on top of a slab block it will do the upside down position unless a block is beside it.
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The same happens when you place it on top of a hopper

Happens to me on upside down halfslabs, redstone blocks, hoppers and upside down stairs.
(Pic attached)

+RedstoneBlock seem to do the same effect

Weird levers on various blocks, applies for all "subtypes", means all kinds of stairs and halfslabs and hoppers facing all directions

More importantly, when you try to flip the switch it pops off instead of switching. This impacts all existing switches on half slabs.

Fixed, but my test array of floating levers still is there until I BUD it xD

The levers still pop off when toggled in 14w27b as @unknown said, but this happens no matter if they are newly-placed or existing. Is popping-off the intended behavior?