title: UICollectionView scrollToItem Not Working in iOS 14
body: <p>I'm using a collection view, UICollectionView, and it works absolutely great...except that I cannot scroll to any particular item. It seems to always scroll to the "middle" is my best guess. In any case, whatever I send to scrollToItem seems to have no effect on the scrolling. I've put it in various locations throughout my view controller but with no success.</p>
  
  <pre><code>override func viewWillAppear(_ animated: Bool) {
      super.viewWillAppear(animated)
      let lastIndex = IndexPath(row: messages.count-1, section: 0)
      self.messagesView.scrollToItem(at: lastIndex, at: .bottom, animated: true)
  }
  </code></pre>