Put the summary of the bug you're having here
The pick doesn't work on double half slabs properly.

What I expected to happen... :
When I middle click a stone type of double half slab I get it but when I place it should remain the same type. Example double wood half slab should stay the same type of wood and double stone slabs should stay the same type of stone.

What actually happened was...:
The slabs changed to double oak wood or double smooth stone slabs.

Steps to Reproduce:
1. Pick block on a double slab (other than double oak wood or double smooth stone slabs.
2. Place it.
3. Watch it change.