Stonecutters are rendered too dark when blocks are placed adjacent to them while smooth lighting is enabled

The Bug:

Stonecutters are rendered too dark when blocks are placed adjacent to them while smooth lighting is enabled.

Steps to Reproduce:

1. Enable smooth lighting and place down a stonecutter.
2. Place blocks all around the stonecutter.
3. Take note as to whether or not stonecutters are rendered too dark when blocks are placed adjacent to them while smooth lighting is enabled.

Observed Behavior:

Stonecutters are rendered too dark.

Expected Behavior:

Stonecutters would not be rendered too dark.