New Essence Reaver doesnt work with Riven's Q

Essence Reaver is supposed to take off 20% of your basic ability Cooldowns per auto for x seconds after you use your ultimate. With Riven her Q doesn't get the 20% cooldown removed per auto until after she has finished casting her 3rd iteration of Q, however the actual cooldown on her Q ability starts ticking down immediately after her 1st Q. Shouldn't essence Reaver start removing 20% per auto the instance Riven uses her 1st Q, and not till after her 3rd?
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