I'm having the same issue, did you find a workaround?

@Cnordvik2 Did you find the cause of the problem, I had the same problem as well.

You may need to set the environment map to IBM. I'm not sure. You can try it.

Strictly speaking, drawing content in an immersive environment in Windows is equivalent to the role played by UIViewRepresentable in a SwiftUI view as you mentioned. This is only because this usually cannot meet usage requirements.