Top of door/trapdoor appears darker when mined

Steps to Reproduce:

1. Place a door and trapdoor
2. Open the trapdoor
3. Stand on top of the door and trapdoor
4. Mine the door and trapdoor in Survival mode

Observed Results:
The top of the door and trapdoor appear darker when mined.

Expected Results:
The tops of doors and trapdoors should not appear darker when mined.