Example project to reproduce UICollectionView sticky headers issue if inserting new section when collection is overscrolled (bounce effect).
See more here:
https://openradar.appspot.com/radar?id=5035016409055232
https://stackoverflow.com/questions/54867434/uicollectionview-sticky-header-disappears-for-while-after-inserting-section-when
Sticky header issue GIF:
Expected look:
Look after section insertion with overscrolled collection:
