We have a UITableView where each row is a custom UITableViewCell embedding its own horizontally-paging UICollectionView (a "card" carousel — think 3 cards visible per row, one page at a time). Sizing is done the standard way via UICollectionViewDelegateFlowLayout:
func collectionView(_ collectionView: UICollectionView, layout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize { return CGSize(width: collectionView.frame.width, height: 213) }
Symptom: On the iPhone Duo simulator, when the device is closed (cover screen, compact width), the row correctly shows the card sized to the screen. When we unfold it (inner display, regular width), the table row itself resizes to the new, much wider screen — but the card inside the embedded collection view stays stuck at its old (closed-state) width, leaving a large empty gap in the row. Folding back closed shows the same problem in reverse: the card stays sized for the wide screen and now overflows/clips.
This does not happen on a normal iPhone/iPad rotation — UICollectionViewFlowLayout picks up the new width fine there. It only reproduces across the fold/unfold transition specificall