[GAMEPLAY] (Another) Yasuo Bug: Q Won't Stack

TL:DR Should Yasuo cast his second Q at the very end of its window, his Q is locked into its first cast until he waits 6 seconds before using his Q again, preventing him from stacking his Q even after multiple successful casts back to back

Alright so before I get into the precise nature of this bug, a bit of relevant Yasuo trivia to make sure we are all on the same page. First, Yasuo's Q isn't actually a stack system, it gives you a new ability when you hit your first or second spell, and always cycles back to the first spell when you cast the third spell (tornado), these abilities are accompanied by buffs accordingly (except for first spell). The following is where my facts might be a little shaky: I believe that some time over the summer (I was without proper internet & PC entire time) the Q buffs were changed from being always 6 seconds to the buff dissipating then being reapplied should you miss the first or second Q (the total time however being the same), and I have reason to believe this timing change caused the bug, a gap in what should be a uniform system.

Anyways onto the actually bug, I queue up, get mid, go to lane, try to stack Q, sounds play normally at first but then I try to knock up my opponent and throw a normal Q instead, then I can't stack Q until I stop using it for 6 seconds (video linked). Watch my Q ability and my buff bar, they completely disagree with each other, also notice how everything looks completely normal until I cast my Q the second time then problems are caused. This is about all I can (confidently) interpret, I hope no big team fights and/or games have been affected by this, especially considering that this locks Yasuo out of the CC & tank busting side of his kit. Has anyone every seen anything like this before?