- add tests to make sure we validate regression

Author: PureWeen

src/Controls/tests/TestCases.Android.Tests/snapshots/android/BlankScreenOnNavigationBack.png

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+<?xml version="1.0" encoding="utf-8" ?>
+<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             x:Class="Maui.Controls.Sample.Issues.Issue28098"
+             xmlns:local="clr-namespace:Maui.Controls.Sample.Issues"
+             Title="Issue28098">
+    <ContentPage.BindingContext>
+        <local:MainPageViewModel x:Name="_viewModel"/>
+    </ContentPage.BindingContext>
+    <StackLayout Margin="20">
+        <Button Clicked="Button_Clicked"
+                AutomationId="Button"
+                Text="Button"/>
+        <CarouselView  WidthRequest="350"
+                       HeightRequest="570"
+                       HorizontalOptions="Fill"
+                       VerticalOptions="Fill"
+                       ItemsSource="{Binding Items}"
+                       Loop="False">
+            <CarouselView.ItemTemplate>
+                <DataTemplate>
+                    <StackLayout>
+                        <Image Source="dotnet_bot.png"
+                               WidthRequest="200"
+                               HeightRequest="200"
+                               Aspect="AspectFill"/>
+                        <Label Padding="10"
+                               VerticalOptions="Center"
+                               HorizontalOptions="Center"
+                               Text="{Binding Name}"/>
+                    </StackLayout>
+                </DataTemplate>
+            </CarouselView.ItemTemplate>
+        </CarouselView>
+
+    </StackLayout>
+</ContentPage>

src/Controls/tests/TestCases.HostApp/Issues/Issue28098.xaml

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+using System.Collections.ObjectModel;
+
+namespace Maui.Controls.Sample.Issues;
+
+[Issue(IssueTracker.Github, 28098, "Returning back from navigation to MainPage would result in a blank screen", PlatformAffected.iOS)]
+public partial class Issue28098 : ContentPage
+{
+	public Issue28098()
+	{
+		InitializeComponent();
+	}
+
+	protected override void OnAppearing()
+	{
+		base.OnAppearing();
+		_viewModel.OnAppearing();
+	}
+	private async void Button_Clicked(object sender, EventArgs e)
+	{
+		await Navigation.PushModalAsync(new ActionPage());
+	}
+}
+
+public class ActionPage : ContentPage
+{
+	public ActionPage()
+	{
+		var button = new Button { Text = "GoBack", AutomationId = "BackButton" };
+		button.Clicked += async (s, e) => await Navigation.PopModalAsync();
+		Content = button;
+	}
+}
+
+public class MainPageViewModel
+{
+	public Command LoadItemsCommand { get; }
+	public ObservableCollection<Item> Items { get; }
+
+	public void OnAppearing()
+	{
+		LoadItemsCommand.Execute(null);
+	}
+
+	void ExecuteLoadItemsCommand()
+	{
+		Items.Clear();
+		Items.Add(new Item() { Name = "Item1" });
+		Items.Add(new Item() { Name = "Item2" });
+	}
+	public MainPageViewModel()
+	{
+		Items = new ObservableCollection<Item>();
+
+		LoadItemsCommand = new Command(() => ExecuteLoadItemsCommand());
+	}
+}
+
+public class Item
+{
+	public string Name { get; set; }
+}

src/Controls/tests/TestCases.HostApp/Issues/Issue28098.xaml.cs

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+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues;
+public class Issue28098 : _IssuesUITest
+{
+    public override string Issue => "Returning back from navigation to MainPage would result in a blank screen";
+    public Issue28098(TestDevice device) : base(device)
+    {
+    }
+
+    [Test]
+    [Category(UITestCategories.Picker)]
+    public void BlankScreenOnNavigationBack()
+    {
+        App.WaitForElement("Button");
+        App.Tap("Button");
+        App.WaitForElement("BackButton");
+        App.Tap("BackButton");
+        VerifyScreenshot();
+    }
+}