ios13/UsingCollectionViewCompositionalLayoutsAndDiffableDataSources ImageView not Rendering

[tj-devel709]

ios13/UsingCollectionViewCompositionalLayoutsAndDiffableDataSources has an issue where the UIImageView inside ConferenceVideoCell.cs does not render. In the screenshots, it appears that there should be a blue background, but the UIImageView does not show up. This occurs in the legacy sample and the dotnet sample