When trying to place the 4x2 painting down it seems to be checking the wrong blocks to determine whether or not the placement is valid.

What I expected to happen was...:
I have a 4x2 wall of cobblestone, and when placing paintings down the 4x2 painting should cover the entire wall.

What actually happened was...:
Either the painting hangs off of the wall and stays placed down, or the painting covers the entire wall but breaks after about 5 seconds.

Steps to Reproduce:
1. Build a wall of some material 4 blocks by 2 blocks.
2. Either place a million paintings or use the /summon command to summon the Fighter painting.
3. Observe