Zhonya activation during Warwick Ult

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[GAME PLAY]

While playing Warwick, I've started to notice a few bugs in regards to his ult. When landing an ult on Cassiopia, she was able to Zhonya during the ult. The same happens with Lee's ult. It appears that the ult lands, but if they have any skills buffered, they still activate regardless, disrupting the ult and suppression.