I’m working on iOS 17+ app in SwiftUI, which uses MapKit.
MapKit’s Map view adds a gradient/material view on Toolbar, which is presented on second and every next navigation.

I would like to get the first’s navigation behavior, which is no background and no shadow image (navbar divider).

This issue is 100% related to the Map view – commenting it out resolves the issue, but also removes the functionality, which I need.

Code:

struct HomeView: View {
    var body: some View {
        NavigationStack {
            Content(/* properties */)
        }
    }
}

struct Content: View {
    // Properties ...

    var body: some View {
        Group {
            if array.isEmpty {
                EmptyStateView()
            } else {
                ListView(data: array, onDelete: onDelete)
            }
        }
        .accentBackground(strong: true) // << Gradient background
        .navigationTitle("Title")
        .toolbar {
            ToolbarItem(placement: .topBarTrailing) {
                AddButton()
            }
        }
    }
}

struct ListView: View {
    // Properties ...

    var body: some View {
        List {
            ForEach(data) { list in
                Row(/* properties */)
            }
            .onDelete(perform: onDelete)
        }
        .scrollContentBackground(.hidden)
    }
}

struct Row: View {
    // Properties ...

    var body: some View {
        NavigationLink(destination: DetailsView(list: list)) {
            VStack(alignment: .leading) {
                Text(list.title)
                    .font(.headline)
                Text(/* sublabel */)
                    .font(.subheadline)
                    .foregroundStyle(.secondary)
            }
        }
    }
}

struct DetailsView: View {
    // Properties ...

    var body: some View {
        List {
            // Some conditional subviews ...

            if let location = list.location {
                Section {
                    // Edit mode conditional remove button ...

                    PresentableMap(location: location)
                        .frame(height: 300)
                }
            }
        }
        .scrollContentBackground(.hidden)
        .accentBackground(strong: true)
        .navigationTitle(list.title)
    }
}

struct PresentableMap: View {
    let location: ListLocation

    private var coordinates: CLLocationCoordinate2D {
        .init(latitude: location.latitude, longitude: location.longitude)
    }

    var body: some View {
        // MapKit View ⬇️
        Map(position: .constant(.camera(.init(centerCoordinate: coordinates, distance: 200))), selection: .constant(location)) {
            Marker(coordinate: coordinates) {
                Image(systemName: "mappin")
            }
        }
        .clipShape(RoundedRectangle(cornerRadius: 8))
        .allowsHitTesting(false)
    }
}

What I tried:

• .toolbarBackground(.hidden, for: .navigationBar) and other SwiftUI modifiers for hidden navbar background – resolves the issue, but also removes the toolbar background for inline navbar, which is presented during scroll. I would like to keep the large title style and present inline navbar only during scroll.
  Screenshot of the bugged scroll:
  
• Overriding UINavigationBarAppearance – breaks whole app.
• Overriding UINavigationBar by its properties using SwiftUIIntrospect – can be used only on the NavigationStack, which leds to the breaking Home and Details views, similar behavior to the first point. Can’t Introspect navigation controller on Map view – I can only Introspect Map, which is MKMapView, which is UIView, which doesn’t have access to NavigationController and its NavigationBar. inputViewController or inputAccessoryViewController are nil.
• Changing the toolbar color to red (which I don’t like, but shows how the app behaves; I don’t want to use any color, even matching one, because it results in the ugly design, where the space is anyway divided and doesn’t match the linear gradient background):

On the gif above you can see that overriding the background respects the safe area, however, the toolbar material added by Map view ignores the safe area.

What do I expect:

• If that’s possible, I would like to keep the List (+its current style) and native NavigationBar with large title.
• Such behavior: