Nolonger able to use the "Pick Block" feature to bring double stone slabs into the inventory.

When I used the "pick block' button on a block that consisted of two stone slabs place one on top of another to form a single block I expected to be able to pick up the double slab and use it as a block.

*What actually happened was since updating to 1.4.6 when I pick a block on a stone double slab I get a single slab in my inventory.

Steps to Reproduce:
1. Place a Stone Slab
2. Place another stone Slab on top of it.
3. Try to Pick the block