Mission Spell Thief (ZOE)

Hi there i wanted to know if that mission counts the Active items as spells when used with Zoe's W or not? Because i don't know if it's a bug but i just played an aram with Zoe and though we didn't win, but i used 8 different unique spells with her W (Spell Thief). Even that, it didn't count for the mission. And it clearly says "Cast 8 unique spells with Spell Thief in 1 game". Not win or anything.
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