In iOS, when using a UICollectionView with horizontal scrolling and only one row of cells: if all the cells have the same width, the spacing between cells is determined by minimumLineSpacing. If the cell widths are different, the spacing between cells is controlled by minimumInteritemSpacing. However, when the cell widths are different and the collectionView's height is smaller than the height of the cells, the minimumInteritemSpacing is applied to the left side of the first cell, causing the left margin of the first cell to become wider. Why does this happen?

When integrating the Wallet Extension, after clicking my app icon from the "From Apps on Your iPhone" list, I encountered the message: "Cannot Add Card. 'XXX' is not responding. Wait a few minutes and try again. If the problem continues, contact the card issuer's customer service" instead of the configured login page appearing as expected. What could be causing this issue, and how should I resolve it?