When you have swords or bows in both hands (any combination), in third person view it looks like you are using both when you block/pull back bow but in first person view it looks like you are just using your main hand weapon. I commented with a lot of related bugs with other combinations of tools and weapons, etc.
What I expected to happen was...:
Either both or just the main hand in both views to activate upon a right-click.

What actually happened was...:
Third Person and First Person did not agree. Dx

Steps to Reproduce:
1. Equip a sword or bow in each hand.
2. Block or use the bow in your main hand.
3. Notice the off-hand does not respond.
4. Go to third person view.
5. Repeat steps 1 and 2.
6. Notice both hands respond to the use of the weapon.