Titanic Hydra canceling Rengar's ult [GAMEPLAY]

Alright so, I'm not sure if this is intentional or not, but whenever you're ulting with rengar and use the active it'll make you cancel your ult, i would understand with where it'll deal damage once activated but Titanic will make your next auto deal more damage, just like his q which only breaks him out of stealth when he attacks, so i don't see why this happens with