Poppy Steadfast bug

When playing Poppy against a Lissandra i assumed that my Steadfast would stop the dash. It didn't, naturally i continued the game under the impression that it was just like other specific abilities that shouldn't be affected by Steadfast. However, when browsing the wiki later, i realised that Lissandra's ability isnt listed under the exemptions. So, I was wondering, is this a bug? Or has it been missed from the wiki?