Vaal Blade Flurry Quality Does Nothing

This was reported over a year ago (https://www.pathofexile.com/forum/view-thread/3579711) and it still seems to be a problem.

Tested with bleed against gruthkul hitting once and then resetting zone. 0 quality and 44 quality had the same damage output over multiple attempts despite the quality saying it should deal 169% more damage.