Thank you! This same thing happened to me and I have been incrementing the build by .1 for 2 years. Now with the new Xcode they change it. Whoa! I think that should be something that has more attention drawn to it.

The only way I could fix my issue was to call myCollectionView.reloadData() and then call Apply!!! I had a segmented control and I am switching the data when I switch segments. DispatchQueue.main.async {  [weak self] in self?.collectionView?.reloadData(). //<------ call this!!! and then call apply self?.datasource?.apply(snapshot, animatingDifferences: false, completion: { [weak self] in