UICollectionView: how to scroll to supplementary element instead of cell?

So here is my setup:

• UICollectionView configured with UICollectionLayoutListConfiguration
• appearance is UICollectionLayoutListAppearancePlain
• headerMode is UICollectionLayoutListHeaderModeSupplementary
• Using UICollectionViewListCell with content configuration
• Implementing collectionView:viewForSupplementaryElementOfKind:atIndexPath: to return custom section header
• Implementing indexTitlesForCollectionView: to return index titles representing the sections (e.g. "A", "B", "C")
• Implementing collectionView:indexPathForIndexTitle:atIndex: to return the index path of the first cell in given section.

Now, when user taps on any index title, the collection view scrolls and positions the first cell of that section at the top. However, the header section (which is sticky) is now overlapping part of the cell.

Any suggestion on how to fix this?

I guess that a new delegate method, such as collectionView:supplementaryElementIndexPathForIndexTitle:atIndex: would probably target this use case (as the collection view would scroll to a section header rather than to a cell).