Teemo blinding dart doesn't work when gromp crits

Teemos Q (blinding dart) does not make the gromp's auto attacks miss as you can see in the gif.

This bug ONLY affects the gromp's crits, (so his first 2 auto attacks.) and it has a 100% reproduction rate.

https://gfycat.com/MealyUnknownInsect

Pretty big considering his attacks do almost 100 damage.