Rengar Bug when casting E during Jump

[GAMEPLAY] Hey, I want to report a little bug I've found on Rengar since it can actually make you miss a kill once in a while and it's quite bothersome.

When casting your E mid-jump on 4 stacks of Ferocity and it hits the target before you're landing, your E will go on cooldown while having 5 stacks of Ferocity ready. So you can't recast your E anymore and it doesn't root either on the first use.

I've also made a little clip to show you what I mean. It works about 50% of the time.