This is a bug in the latest snapshot: 14w32d.
I started a new world today checking out all the new features in survival. I placed down one of the new doors from the snapshot to check it out
and when I broke it, I got the old wooden door back.
I expected that the door that was placed would be the same door when broken.
But instead I got the old wooden door back from it.

Steps to Reproduce:
1. Place on of the new doors added in the 14w32d snapshot.
2. Break the door in survival.
3. You get a wooden door and not the one you have originally placed.