1.place a half slap (upside down)
2.place a trapdoor on the half slab
3.put a lever on the top of the slab
4.open the trapdoor
5.use the lever
6.it will close
7.flip the lever again
8.doesent work at all
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Comments 4
I can see why it doesn't work after the first time (because half-slabs do not conduct redstone), but I have no idea why it works the first time.
The lever updates the trapdoor (even though it's not connected to it), and since the trapdoor is updated while not receiving power, it closes (but doesn't open when the lever is flicked because it's not actually connected to it).
Duplicate of MC-3582.
Confirmed, see screenshots.