Sneak doesn't display first-person bobbing

When I'm blocking with the sword, the bobbing appears.

Thinking this may be Working as Intended as when your sneaking your not "walking with the same force" so you wouldn't really bob, and if your holding a sword your now steadying a heavy object so you would bob a little.. but it is a game where blocks float in mid air and zombies and skeletons and spiders the size of your torso roam the world so this may not be entirely a correct assumption

Sneaking with a sword doesn't show bobbing either...