For iOS 14

Apparently there is a new bug in UICollectionView that is causing scrollToItem to not work when paging is enabled. The work around is to disable paging before calling scrollToItem, then re-enabling it afterwards:

collectionView.isPagingEnabled = false
collectionView.scrollToItem(
    at: IndexPath(item: value, section: 0),
    at: .centeredHorizontally,
    animated: true
)
collectionView.isPagingEnabled = true

Source: https://developer.apple.com/forums/thread/663156