(Vayne) items don't stacks

i was trying vayne on the new game mode (black market brawlers) so i decided to build a devourer to futher turn it in a sated devourer plus typhoon claws, i first decided to buy typhoon claws and the a devourer, everything was fine, typhoon claws stacks worked perfectly till i reached the max stacks on the devouver, as soon it turn into a sated devouver the passive on typhoon claws stopped working, i don't know if it is a bug or is just for work like that. if it is a bug please fixed will super op for champs like vayne or twitch in the jungle.
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