The Earth Dagger #5 skill “Churning Earth” doesn’t cancel properly.
It is a long cast (~ 3 seconds), and if you attempt to cancel it mid-cast after casting for > 1/2 second, it goes on the full 30 second cooldown instead of the standard 4 second cooldown that it should.
This is the absolute worst kind of ability that this could happen to. It’s already hard enough to land in PvP, and I believe it should go on the 4 second cooldown upon cancellation.