Problem
When using default keybinds I am unable to use the bow stun attack with the hunter bow when I have charged shot unlocked.
When aiming at an enemies head with a hunter bow when they are stunned it says "R use stun attack" but instead it uses the charged shot since both of the keybinds for "Alternate Fire" and "Special Attack" are the same by default.

Workaround
Change keybind for either "Alternate Fire" or "Special Attack" and then they will work independantly.

My idea of a solution
When aiming at the enemies head and the stun attack is available then the bow should do that instead of the charge shot/alternate fire. If the stun attack is not available (not aiming at their head when they are stunned) then do the charge shot/alternate fire.
This is probably what was intended but might not have been found in testing

I don't know if this happens with other abilities since I have only found it with this one.