Door breaks when placed on top slab or stairs

Door breaks when put on a slab (half block) or stairs.

What I expected to happen was...:
I expected the door to go on the slab or stairs.

What actually happened was...:
The door broke.

Steps to Reproduce:
1. Put a stone slab on the upper part of a block (like in the attached pictures) or place stairs.
2. Put a door on the slab or stairs.
3. The door breaks and drops.