Swift 将contentInset添加到orthogonalScrollingBehavior部分会导致倒数第二个单元格跳过

我使用正交剖面制作了UICollectionViewCompositionalLayout，其中分组分页居中，如下所示：

func neighborsRealitiesSection() -> NSCollectionLayoutSection {
  let itemSize = NSCollectionLayoutSize(widthDimension: .fractionalWidth(1), heightDimension: .fractionalHeight(1))
  let item = NSCollectionLayoutItem(layoutSize: itemSize)
    
  let cellWidth = UIScreen.main.bounds.width / 3 + 1
  let groupSize = NSCollectionLayoutSize(widthDimension: .absolute(cellWidth), heightDimension: .absolute(cellWidth))
  let group = NSCollectionLayoutGroup.vertical(layoutSize: groupSize, subitems: [item])
    
  let section = NSCollectionLayoutSection(group: group)
  section.orthogonalScrollingBehavior = .groupPaging
    
  let inset = (UIScreen.main.bounds.width - cellWidth) / 2
  section.contentInsets = .init(top: 0, leading: inset, bottom: 0, trailing: inset)
    
  return section
}

如果我将ContentInset添加到该部分，collectionView将不会停止在倒数第二个单元格上滚动。它将滚动到下一个单元格。如果我对contentInsets进行评论，就可以了

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为什么会这样？有人有这个问题吗？

如果单元格占据屏幕的一半以上，它就会工作。这是我能找到的全部。