This claim is dependent on what satisfies the "use 8 unique spells with spell thief in one game" with Zoe's mission. If it is for using 8 spells, regardless if you've used 2 or more of the same type (i.e. Flash), then I had a case where the condition was satisfied but then reset after completing the "win 3 games as, with, or against Zoe."

It went like this:

#1st game as Zoe: (fast forwarded through the replay to try and count how many times I used spell thief)

• used at least 7 "truly unique" spells with spell thief (flash, heal, exhaust, barrier, chilling smite, cleanse, hextech gunblade active) as well as using several flashes and a second chilling smite. Now there might have been a time during the moments where fast forward caused me to miss say, an ignite, but let's assume there isn't. If the several flashes and chilling smites do count on top of the 7 mentioned, then the condition for "use 8 spells with spell thief in one game" was satisfied. Else, there might be no bug if the uniqueness is bound to spell type.

• had 22 of 25 paddle star redirects for condition 2.

• won the game

#2nd game with a Zoe was against a Zoe

• won the match, giving 2 of 3 for "win 3 games as, with, or against Zoe."

#3rd game as a Zoe

• redirected the last 3 needed paddle stars to complete the 2nd condition for the mission.
• surrender occurred, we lost.
• used at least 5 "truly unique" spells with spell thief, may have used 2+ flashes with it.

4th game with a Zoe was against a Zoe

• won the match, completing the first condition
• however, if the 3rd condition was not met with game one, then the 3rd condition was never met during this and I was hallucinating. Otherwise, it rest at this game, since I checked after each to monitor my progress.