I would love to see the stats on how much time Zinchenko spends in the middle versus last season, because it certainly looks like he's gone from a LB who inverts, to a CM who covers the left flank. It looks to me that he supports Rice in the build up far more than he ever supported Partey and we've lost his unpredictability because of his lack of under and over lapping down the left flank.
Rice has improved his passing between the lines, particularly in finding Odegaard in the half spaces, but it's taking a while for that channel to develop. Additionally, he misses countless opportunities to progress play through the centre due to a lack of awareness, bravery and agility.