Challenges in History of Zero Chill are bugged, as well.
First three challenges worked (12th day, mahome alone, crystalline spire) but the fourth, Arctic Citadel bugged out on me.
It want's you to rush for a first down in 2 plays for bonus, starting at 2nd and 15 (did it) and to rush for 30 yards in 4 plays to complete the challenge (did it) and when I challenge compete'd me, ti gave me 2 stars.
One thing I have noticed and it may have something to do with the bug -- normal challenges from other areas always start out with "empty" stars and you pick the number of stars/difficulty and begin the challenge....
But, in Zero Chill "bugged" challenges start out with 1 star difficulty and when you move it over to max, the challenge complete seems to always give the wrong results. Not sure if it has anything to do with bug, but it seemed strange because I've never seen Madden in the past start out with a star difficulty on any challenges I've played.