UICollectionViewCompositionalLayout pinned headers break with section that have orthogonalScrollingBehavior

When using UICollectionViewCompositionalLayout and creating a layout that supports pinned supplementary items and additionally having a section that has orthogonalScrollingBehavior the pinned header will disappear as soon as you scroll over the section with the orthogonalScrollingBehavior. A simple layout that demonstrates how it breaks looks like this

Code Block
    func createLayout() -> UICollectionViewLayout {
        let itemSize = NSCollectionLayoutSize(widthDimension: .fractionalWidth(1.0),
                                             heightDimension: .fractionalHeight(1.0))
        let item = NSCollectionLayoutItem(layoutSize: itemSize)
        let groupSize = NSCollectionLayoutSize(widthDimension: .fractionalWidth(1.0),
                                              heightDimension: .absolute(44))
        let group = NSCollectionLayoutGroup.horizontal(layoutSize: groupSize, subitems: [item])
        let section = NSCollectionLayoutSection(group: group)
        section.interGroupSpacing = 5
        section.orthogonalScrollingBehavior = .continuous
        section.contentInsets = NSDirectionalEdgeInsets(top: 0, leading: 10, bottom: 0, trailing: 10)
        let sectionHeader = NSCollectionLayoutBoundarySupplementaryItem(
            layoutSize: NSCollectionLayoutSize(widthDimension: .fractionalWidth(1.0),
                                              heightDimension: .estimated(44)),
            elementKind: PinnedSectionHeaderFooterViewController.sectionHeaderElementKind,
            alignment: .top)
        let sectionFooter = NSCollectionLayoutBoundarySupplementaryItem(
            layoutSize: NSCollectionLayoutSize(widthDimension: .fractionalWidth(1.0),
                                              heightDimension: .estimated(44)),
            elementKind: PinnedSectionHeaderFooterViewController.sectionFooterElementKind,
            alignment: .bottom)
        sectionHeader.pinToVisibleBounds = true
        sectionHeader.zIndex = 2
        section.boundarySupplementaryItems = [sectionHeader, sectionFooter]
        let layout = UICollectionViewCompositionalLayout(section: section)
        let layoutHeaderHeader = NSCollectionLayoutBoundarySupplementaryItem(
            layoutSize: NSCollectionLayoutSize(widthDimension: .fractionalWidth(1.0),
                                              heightDimension: .estimated(44)),
            elementKind: PinnedSectionHeaderFooterViewController.layoutHeaderElementKind,
            alignment: .top)
        let configuration = UICollectionViewCompositionalLayoutConfiguration()
        layoutHeaderHeader.pinToVisibleBounds = true
        configuration.boundarySupplementaryItems = [layoutHeaderHeader]
        layout.configuration = configuration
        return layout
    }


This is an adapted part of the code provided by this example: https://developer.apple.com/documentation/uikit/views_and_controls/collection_views/implementing_modern_collection_views

Replies

Unfortunately still a bug.
Xcode 12.3
iOS 13

Still a bug.

Xcode 12.5.1 iOS 14.8