The main hand is positioned incorrectly when holding a loaded crossbow in your offhand

The bug

 

The main hand is positioned incorrectly when a fully-charged crossbow is in the offhand. Screenshots are attached.

How to reproduce

1. Load a crossbow
2. Put the crossbow in your offhand.
    Hand position is incorrect.

 

Keep in mind that the hand position is corrected during the punching animation when the crossbow is in your offhand, but reverts to the bugged behavior once the punching animation has completed.