As said in title, the Prize Magnet mission which requires 3 ARAM mission to be completed with a day is bugged.
My mission progression has been stuck at 1/3 since yesterday. Even though I completed 4 mission within the last three hours.
So no Hextech chest and key from this event. Only XP and BE.
I have tried restarting the client and visiting the store page several times, that particular mission won't move. All it requires is that you complete 3 event mission in one day....
Edit: Problem solved. Wish I could change thread title.