change theme for ReaderView inside NavigationStack

[sergeydi]

I use this code to show ReaderView:

var body: some View {
    NavigationStack {
        VStack {
            ReaderView(controller: viewModel.readerController)
                .ignoresSafeArea()
        }
        .onAppear {
            viewModel.loadBook()
        }
    }
}

I have a button to change theme.

class ContentViewModel {
    ...
    func setTheme(_ theme: Theme) {
        Task {
            try? await readerController.change(theme: theme)
        }
    }
}

When I change theme, it changed, but I have a problem with Navigation Bar:
Start theme:

Set dark theme (Book scroll is on top, Navigation Bar is white):

Scroll book a little bit down:

How to fix the issue with Navigation Bar theme when Book scroll is on top?