TintColorBug.swift

import SwiftUI

extension UIColor: Identifiable {
    public var id: String {
        get { self.accessibilityName }
    }
}

struct ContentView: View {
    let defaultColor = UIColor.systemBlue
    let colors: [UIColor] = [
        .systemRed,
        .systemGreen,
        .systemYellow,
        .systemBlue,
    ]
    
    @State var navigationValue: String?
    @State var selectedColor: UIColor?
    
    var body: some View {
        NavigationSplitView {
            List(selection: $navigationValue) {
                NavigationLink("Tint Color", value: "test")
            }
            .navigationTitle("Home")
        } detail: {
            Text("⬆️ Back button and/or display-mode button above should change color after choosing a new color:")
            List(selection: $selectedColor) {
                ForEach(colors) { color in
                    Button {
                        selectedColor = color
                        navigationValue = nil
                    } label: {
                        Text(color.accessibilityName)
                    }
                }
            }
        }
        .tint(Color(uiColor: selectedColor ?? defaultColor))
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

Happy to report that this is fixed in iOS 16 developer beta 7.