судя по тексту - ячейка высотой больше размера UICollectionView
Вот такое ещё пишет: 2021-01-06 14:55:31.157493+0200 MobilAutoNew.iOS[9218:57974] The relevant UICollectionViewFlowLayout instance is <Xamarin_Forms_Platform_iOS_ListViewLayout: 0x7fc38fc237c0>, and it is attached to <UICollectionView: 0x7fc38f185e00; frame = (0 0; 375 165); clipsToBounds = YES; autoresize = W+H; gestureRecognizers = <NSArray: 0x600000643960>; layer = <CALayer: 0x600000c97d80>; contentOffset: {0, 0}; contentSize: {853, 166}; adjustedContentInset: {0, 0, 0, 0}; layout: <Xamarin_Forms_Platform_iOS_ListViewLayout: 0x7fc38fc237c0>; dataSource: <Xamarin_Forms_Platform_iOS_GroupableItemsViewController_1: 0x7fc38fc23f60>>.