First person off-hand block rotation doesn't match third person

In third person blocks have the front face pointing in front of the player model, but in first person blocks are rotated counter-clockwise 90° to how the main hand would hold them. This results in the front face of blocks actually pointing backwards in the first person off-hand.

This is mostly noticeable with blocks that have a top texture which points in a direction (Observer, some trapdoors)