I found this bug while playing survival (it also happens in creative), I figured that the empty space under the bed would allow me to hit the block under the bed. Basically, the bug, is like how the stairs were, how you couldn't hit through them.

What I expected to happen was...:
I expected to be able to break the block under the bed.

What actually happened was...:
I broke the bed

Steps to Reproduce:
1. Place Bed
2. Try to break block under bed by hitting the empty space under the bed.
3. The bed should break after a few seconds, instead of the block under it.