Wooden trapdoors sound like the block beneath them.

Bug:
Wooden trapdoors make the same sound as the block below it, sounding like the player is walking on the block below the trapdoor.

Steps to Reproduce:
1. Get a wooden trapdoor.
2. Place it on any block that can make sound. (for example: Sand, Grass Block, Planks, etc.)
3. While being on the trapdoor, walk on it. Side to side, forwards and backwards, whatever way you want.
4. It will make the sound of the block beneath it.

Note: If the trapdoor is placed in air, it will make no sound.