Guild Wars 2

I didn’t see any thread about this.

The trait decreases correctly the CD of the staff skills, BUT it doesn’t increase the boon durations on any staff skill.

I tested, it works, only the tooltips are wrong.

Yes it does give you the 20% but it does not show up on your character and you do not see it on any of the tool tips.
It would be nice to see this fixed so you can make accurate decision’s when building a character.