Beds are duplicated when you break them at the head end (pillow part)

What I expected to happen was...:
Only one Bed should drop when you break it. No matter on what end of the bed you break it.

What actually happened was...:
When i break the Bead on the Foot end only one Bed drops, but whe I break it at the top end (pillow part) two beds drop.

Steps to Reproduce:
1. place bed in survival
2. break the bed at the top end (pillow part)