Ezreal Rylai's Bug

Ezreal's q is not affected by the slow on rylai's crystal scepter, even though it clearly states in the ability description that Ezreal's q applies on hit effects. This has happened to me on multiple occasions whilst playing Legend of the Poro King. However, I had the same results when trying this in a custom. Against minions, all of Ezreal's spells apply a Rylai's slow (characterized by a frosty look and ice beneath the target) except for his w and q, with his w being an exception as it doesn't damage the minions so it doesn't slow. I tried the q lots of times, but no cheese. I have seen all his other abilities apply slows on champions, too. This bug isn't game-changing, but it's really annoying to not be able to run away as adequately as you might be able to if you had more than 2 readily available slows. I don't have any videos of it, but in around 7-8 minutes you can see it for yourself. Please fix this! I want to be able to use my builds properly and not get easily chased down by tanks.