Iron Golem not able to be crushed?

Golems no longer are damaged when their hitbox space is invaded by blocks in a "crusher" system.

if you spawn a golem in a 2x3 area they will take damage and die;
if you drop a golem into a 2x3 area they wont receive damage.
if you use pistons to force a 1x3 area of the 2x3 area no damage will occur.
if you place into a 3x3 area and use pistons to forcing a 1x3 area no damage [see image].

you can also push a golem into a transparent wall with no damage or a opaque wall they will travel through.