[GAMEPLAY] - Jhin movespeed passive not benefiting from additional attackspeed while buff is active

If Jhin crits a target, he gains increased movement speed from his passive. This movespeed scales based on Jhin's bonus attack speed. If Jhin crits a target and gains the movespeed buff, then gets his attack speed increased by getting an ardent censer buff for example, and then continues to attack and crit, his bonus movespeed will not benefit from the ardent censer attack speed buff until the buff expires (i.e. Jhin stops attacking or reloads). This is pretty detrimental to my full attack speed Jhin memebuild, especially with the new PBE keystone rune Lethal Tempo.

Easiest way to test bug:

1. Enter a practice tool game as Jhin
2. Get 100% crit chance through items (buy 5 Infinity Edges, for example)
3. Buy a Guinsoo's Rageblade
4. Attack a target dummy several times (make sure you have nothing other than Jhin's passive affecting your movement speed to more easily test this; no warlord's bloodlust, for example)

Expected result: Jhin's movement speed rises further with every attack as he builds attackspeed from Guinsoo's Rageblade.

Observed result: Jhin's movement speed remains the same despite his Guinsoo's Rageblade stacks, unless he waits for his movement speed buff to expire.

100% reproduction rate btw.