Steps to reproduce
Place a trapdoor.
Place the lever or button on the trapdoor.
The lever / button just drops out.
MC-117118
Levers / buttons placed on the trapdoor are dropped if pressed
Resolved
Fixed
0
The bug might rather be that you can place them on the trapdoor in the first place. If that is not a bug then there is a different bug that pressure plates cannot be placed on closed trapdoors.