About the mission clear bug

Hello Riot. I am one of the league lover I hope you are having a great day.

I am just wondering about the new missions that you guys made with Odessey level Onslaught.

I cleared with 5 Yasou and all of our member was with 3 aug without passive.

However after we won the mission didn't complete.

I am Just wondering if this is some kind of bug or do I need to clear with some different ways to clear this mission.

I also have the screen shot that will proof that I cleared with 5 Yasuo.

Thank you and have a great day.