Fiora's W ability blocks ignite?

Hello! i just have one quick question does Fiora's W ability block ignite? because i was in a game against a fiora in mid lane and i was playing Annie. At one point my jungler came to gank while she is in her parry stance i use ignite on her but i didnt see the ignite affect her at all and she already blocked my stun and she survives because of my ignite not landing on her. is this a bug or was this intended?
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