I had 2 event challenges and 2 normal challenges on my weekly challenge board and I happened to complete all 4 challenges on 1 match (1 of which was the Play any match XP drip challenge). I noticed that I progressed 4 levels in the event pass, but had only completed 2 event specific challenges.
IDK if this is a bug or not, but if its not a bug, I can’t be upset at them making progressing the event pass quicker.