When you break a door from the lower half it displays particles that it has been broken from both parts slightly apart. The bug also applies to breaking the end of beds.

What I expected to happen was...:
It should have displayed one set of particles, as it does when you break from the top.

What actually happened was...:
When the bottom block was broken, the first set of particles were released and then there was a second set.

Steps to Reproduce:

1. Find or place a door in the world
2. Left click on the bottom block of the door to break it
3. Observe the multiple particles that often appear.