Guild Wars 2

I have Quickening Thirst, which is supposed to reduce dagger cooldowns by 33% when above the health threshold.

However, every time I use Life Siphon and cancel the channeling (most of the time), the skill cooldown is not reduced. I works fine when Life Siphon is fully cast, but canceling at any point seems to cause Quickening Thirst to not work.

Known issue? Any workaround?

Finish the cast is a good workaround. Keeps you above 75% more effectively anyway.