Dark mode in SwiftUI Preview doesn't have a dark background with Xcode 11.4

Question

Does anyone have the same problem, that Xcode (11.4) doesn't show a dark background, when previewing in dark mode?

Steps to reproduce:

1) Create a new project, a Single View App

2) Add the .environment-modifier to the preview:

Group {
    ContentView()
        .environment(\.colorScheme, .light)
    ContentView()
        .environment(\.colorScheme, .dark)
}

You get this result:

Answer 1

Setting \.colorScheme in the environment is deprecated, so instead use the .preferedColorScheme modifier. For example,

ContentView()
    .preferredColorScheme(.dark)