Kha'Zix Bug in Brush?

{{champion:121}} Okay so I was playing as zed in Hexakill today and when kha'zix enters the river brush (which was warded) he used his ult within our vision in the brush but stayed invisible and unseen until I used my Q skill shot to confirm that he's actually there instead of a visual error. And he did this repeatedly so I was extremely confused
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