Commanding Voice is Bugged
I’m guessing it has an effect once you’re in combat, like the other one that increases pet boon duration but only when in combat.
I don’t know how they implemented pets, but they definitely did something funky and cheesey. Out of combat pets seem like a different asset than in combat pets.
Champion Hunter
It has an effect outside of combat, it just doesn’t change the tooltip of the f2 skill. One of my builds uses Forage with Commanding voice.
There is a bug though (which I have reported) where commanding voice will stop working after using it awhile, usually after you go swimming.