Rengar E still bugged!

So forgot to post this right after the game in question and was just reminded now, and I think it's worth bringing up even this late afterwards since it wasn't in the patch notes for 6.10.

But you know that bug Riot claimed to fix in 6.9 where using his E just as he got 5 fero stacks would no longer put his Emp E on cooldown immediately without using the ability? Well the funny thing is I actually had NEVER experienced it before the "bug fix," seemed kind of random but hey I figured it was just one of those things I just simply never noticed, happens all the time with bugs.

However earlier this week it happened to me, AFTER patch 6.9 was released where it was supposed to fix this bug I had never even heard about! I used my E as I was getting max fero stacks and it went on a full cooldown... so yeah it does in fact exist, but at least for me only after it was "fixed" in the previous patch....

Just thought I should let you guys know you fucked something up, I get bug fixes can be complicated, but I don't see why it would just not be fixed at all after the patch that pointed out that it was going to be fixing it.....