minimumInteritemSpacing does not work with ListSectionController

[congpt-xamarindev]

I create horizontal collection view inside the vertical collection view by using ListSectionController. When I set the value to minimumInteritemSpacing, it does not affect, but it works when I set the inset = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: cellSpacing). What's wrong with it?
And selecting the item, the callback below always return index = 0
func didSelectItem(at index: Int)
BTW: Anyone knows how to set minimumLineSpacing for ListSingleSectionController?