Pyke ult going through fiora w

I have already posted this in the "champion and gameplay" board, but this seems more like a bug to me now, so I'll repost it here: Just as the title mentions, how is this a thing? As far as I know fiora w parries every single ability in the whole game, why does this go through? "Fiora's W: Riposte makes Fiora invulnerable (for example like Kayle's ult), and that should block the execution of Pyke's ult. "Invulnerability and undying effects will still protect the target." Quote from" Thanks to Grimmrok for this information. Example 1: Example 2:
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