SwiftUI presentationMode dismiss not work on specific case

Code Block 
navigationController?.present(controller, animated: true)

Code Block 
navigationController?.pushViewController(controller, animated: true)

Code Block Swift
struct ViewBB: View {
    var body: some View {
        Text("ViewBB")
    }
}
struct ViewB: View {
    @Environment(\.presentationMode) var presentationMode
    var body: some View {
        NavigationView {
            ViewBB()
            .navigationBarTitle("View B", displayMode: .inline)
            .navigationBarItems(leading: Button("Cancel") {
                self.presentationMode.wrappedValue.dismiss()
            })
        }
    }
}
struct ContentView: View {
    @State private var isPresetend: Bool = false
    var body: some View {
        VStack {
            Button(action: {
                self.isPresetend.toggle()
            }, label: { Text("Change view") })
            .sheet(isPresented: $isPresetend, content: { ViewB() })
            .navigationBarTitle("View A", displayMode: .inline)
        }
    }
}

I will add a case where I experienced the same problem and how I did solve it.

I noticed also this problem when modifying my DataModel which is a @EnvironmentObject

When the button Save was pressed I was updating the dataModel and then dismissing the view with the presentationMode object. That was causing the dismissal to not work at all. Dismiss was working fine in the example below if the author was not valid so the model was not updated.

I narrowed the problem down to the dataModel.authors marked as @Published. If I do remove the annotation it will work. So It seems like a SwiftUI bug to me.

Cos I need the authors to be @Published so the changes are updated in the other views, a way to fix it is for this particular case is to have a @State var shouldSave: Bool and use the method onDisappear() to then set the values to the model.

Also using a delay with asyncAfter on the button Save do work cos the view will be first dismissed and then the values are updated.

See code for better context:

.toolbar {
     Button("Save") {
          shouldSave.toogle()
          self.presentationMode.wrappedValue.dismiss()
     }
}.onDisappear {
      guard shouldSave else { return }
      author.name = authorName
      if isValidAuthor(author) {
          dataModel.authors.append(author)
      }
}

Wow, its 1 year later and this bug is still not fixed. I used this brute force workaround inside a button action:

if var topController = UIApplication.shared.windows.first!.rootViewController {
	while let presentedViewController = topController.presentedViewController {
		topController = presentedViewController
	}
	topController.dismiss(animated: true)
}

This issue still exists. The other way I was able to fix it is to make the navigationTitle form .large to .inline of the screen that calls the view in presentation mode.

One workaround would be to dismiss any open sheets before the app is sent to background. This is what I'm doing. Obviously not ideal, and will also close sheets if someone pops over to their control center or notifications/lock screen, but better than vital buttons not working. 😅

.onReceive(NotificationCenter.default.publisher(for: UIApplication.willResignActiveNotification)) { _ in
  self.isSheetPresented = false
}

I may have not got the issue correctly, but what I am making out of this problem is you are trying to dismiss ViewBInsideNavigationView using Navigation Views. But thats not how this code should be used. Navigation Views work like a tree, you create child views from root view, and when you go back, or dismiss the child view, you land BACK on the root view.

As per Apple documentation - https://developer.apple.com/documentation/swiftui/environmentvalues/dismiss, you use dismiss( or PresentationMode) to Pop the current view from a Navigation stack.

You are trying to dismiss root view here, because you have accessed presentationMode, on view where Navigation view starts, and trying to dismiss it. I don't think dismiss in Navigation views are supposed to work like that.

Please go through the above documentation for proper use.

PS: presentationMode is deprecated to dismiss in 17.0