It looks like the views are redacted. This is a known behavior (issue?) with widgets. You can try to display the unredacted view by adding the .unredacted() modifier to your view, like this:

case .systemMedium:
            /// Display the MovieWidgetView for the medium widget size
            MovieWidgetView(topThreeMovies: [dummyMovie, dummyMovie, dummyMovie])
                .unredacted()