He was on the bench in the cup final and last few games. You don’t put a vital player on the bench in your biggest match for years.
He had been out injured, and was not fit.
The game before the cup final, he was on the bench away at Old Trafford and only played 25 minutes.
Rodgers rushed him back, because Praet had injury problems too, Barnes was out and ultimately Maddison wasn't fit enough to play well.