Different stacking slab sound

Put the summary of the bug you're having here

What I expected to happen was...:
To play the normal placing sound for stone/wood when stacking a slab onto another slab

What actually happened was...:
It played the sound for placing stone/wood that was added in one of the snapshots but then removed

Steps to Reproduce:
1. Place a slab
2. Place another slab onto the slab you placed (Hear the difference?)