Riots Invisibility makes no sense.

So with Preseason Riot introduced the two different types of getting invisible. What makes me upset now is the fact, that Riot said everywhere, that Invisibility is being uncovered by enemy turrets. So explain me the following: How was able to see me as in the jungle? I ulted and he kept seeing me. That makes me think, that lee is clearly still able to uncover invisibility too, which, again, should only be possible for enemy turrets. What makes me even more upset is that this pretty much makes Kha's ult not worth to use anymore. He doesn't get Unseen Threat anymore because he doesn't go out of enemys sight anymore. So the only thing left to my knowledge is a little speed buff, which is nice to have, but not very useful fighting against somebody who can easily jump right to you.

So just explain me please, why was Riot so inconsistent when recreating a games mechanic? Or am I just as blind as and saw something wrong (I clearly saw him aa me and my ult being on cd)?