[Android] Fix Shell singleton page rendering blank when re-pushed after absolute route reset

src/Controls/src/Core/Compatibility/Handlers/Shell/Android/ShellItemRendererBase.cs

@@ -406,25 +406,27 @@ void RemoveAllButCurrent(Fragment skip)
 
 		void RemoveAllPushedPages(ShellSection shellSection, bool keepCurrent)
 		{
-			if (shellSection.Stack.Count <= 1 || (keepCurrent && shellSection.Stack.Count == 2))
-				return;
-
-			var t = ChildFragmentManager.BeginTransactionEx();
+			FragmentTransaction t = null;
 
 			foreach (var kvp in _fragmentMap.ToList())
 			{
 				if (kvp.Key.Parent != shellSection)
+				{
 					continue;
+				}
 
 				_fragmentMap.Remove(kvp.Key);
 
 				if (keepCurrent && kvp.Value.Fragment == _currentFragment)
+				{
 					continue;
+				}
 
+				t ??= ChildFragmentManager.BeginTransactionEx();
 				t.RemoveEx(kvp.Value.Fragment);
 			}
 
-			t.CommitAllowingStateLossEx();
+			t?.CommitAllowingStateLossEx();
 		}
 
 		void RemoveFragment(Fragment fragment)

src/Controls/tests/TestCases.HostApp/Issues/Issue36853.cs

@@ -0,0 +1,111 @@
+namespace Maui.Controls.Sample.Issues;
+
+// Reproduces the bug: Root → SecondPage (singleton) → ThirdPage → ///Root → SecondPage again → BLANK
+[Issue(IssueTracker.Github, 36853, "Shell singleton page renders blank when re-pushed after absolute route PopToRoot on Android", PlatformAffected.Android)]
+public class Issue36853 : TestShell
+{
+	protected override void Init()
+	{
+		Routing.RegisterRoute("Issue36853Second", typeof(Issue36853SecondPage));
+		Routing.RegisterRoute("Issue36853Third", typeof(Issue36853ThirdPage));
+
+		var mainPage = new ContentPage
+		{
+			Title = "Main",
+			Content = new VerticalStackLayout
+			{
+				Spacing = 20,
+				Padding = 20,
+				Children =
+				{
+					new Label
+					{
+						Text = "Main Page",
+						AutomationId = "Issue36853MainLabel",
+						FontSize = 24
+					},
+					new Button
+					{
+						Text = "Go to Second Page",
+						AutomationId = "Issue36853GoToSecond",
+						Command = new Command(async () =>
+							await Shell.Current.GoToAsync("Issue36853Second"))
+					}
+				}
+			}
+		};
+
+		AddContentPage(mainPage, "Issue36853Main");
+	}
+}
+
+// Registered as Singleton in DI — same instance returned every time the route resolves
+public class Issue36853SecondPage : ContentPage
+{
+	public Issue36853SecondPage()
+	{
+		Title = "Second";
+		Content = new VerticalStackLayout
+		{
+			Spacing = 20,
+			Padding = 20,
+			Children =
+			{
+				new Label
+				{
+					Text = "Second Page Content",
+					AutomationId = "Issue36853SecondLabel",
+					FontSize = 24
+				},
+				new Button
+				{
+					Text = "Go to Third Page",
+					AutomationId = "Issue36853GoToThird",
+					Command = new Command(async () =>
+						await Shell.Current.GoToAsync("Issue36853Third"))
+				}
+			}
+		};
+	}
+}
+
+public class Issue36853ThirdPage : ContentPage
+{
+	public Issue36853ThirdPage()
+	{
+		Title = "Third";
+		Content = new VerticalStackLayout
+		{
+			Spacing = 20,
+			Padding = 20,
+			Children =
+			{
+				new Label
+				{
+					Text = "Third Page Content",
+					AutomationId = "Issue36853ThirdLabel",
+					FontSize = 24
+				},
+				new Button
+				{
+					Text = "Reset to Root (///)",
+					AutomationId = "Issue36853ResetToRoot",
+					Command = new Command(async () =>
+						await Shell.Current.GoToAsync("///Issue36853Main"))
+				}
+			}
+		};
+	}
+}
+
+static class Issue36853Extensions
+{
+	public static MauiAppBuilder Issue36853RegisterServices(this MauiAppBuilder builder)
+	{
+		// SecondPage is singleton — same instance reused across navigations (the bug scenario)
+		builder.Services.AddSingleton<Issue36853SecondPage>();
+		// ThirdPage is transient — new instance each time (normal behavior)
+		builder.Services.AddTransient<Issue36853ThirdPage>();
+		return builder;
+	}
+}

src/Controls/tests/TestCases.HostApp/MauiProgram.cs

@@ -41,7 +41,8 @@ public static MauiApp CreateMauiApp()
 				.Issue18720DatePickerAddMappers()
 				.Issue18720TimePickerAddMappers()
 				.Issue28945AddMappers()
-				.Issue25436RegisterNavigationService();
+				.Issue25436RegisterNavigationService()
+				.Issue36853RegisterServices();
 
 #if IOS || MACCATALYST
 			appBuilder.ConfigureCollectionViewHandlers();

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue36853.cs

@@ -0,0 +1,42 @@
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues;
+
+public class Issue36853 : _IssuesUITest
+{
+	public override string Issue => "Shell singleton page renders blank when re-pushed after absolute route PopToRoot on Android";
+
+	public Issue36853(TestDevice testDevice) : base(testDevice)
+	{
+	}
+
+	[Test]
+	[Category(UITestCategories.Shell)]
+	public void SingletonPageShouldRenderAfterPopToRootAndRePush()
+	{
+		// Step 1: From root, push SecondPage (singleton)
+		App.WaitForElement("Issue36853GoToSecond");
+		App.Tap("Issue36853GoToSecond");
+
+		// Step 2: Verify SecondPage renders
+		App.WaitForElement("Issue36853SecondLabel");
+
+		// Step 3: Push ThirdPage on top (so stack is Root → Second → Third)
+		App.Tap("Issue36853GoToThird");
+		App.WaitForElement("Issue36853ThirdLabel");
+
+		// Step 4: PopToRoot via absolute route ///
+		App.Tap("Issue36853ResetToRoot");
+		App.WaitForElement("Issue36853MainLabel");
+
+		// Step 5: Re-push SecondPage (same singleton instance)
+		App.Tap("Issue36853GoToSecond");
+
+		// Step 6: SecondPage content must be visible — not blank
+		// Without the fix, WaitForElement will timeout because the stale fragment
+		// has a disconnected handler and OnCreateView never fires — page is blank.
+		App.WaitForElement("Issue36853SecondLabel");
+	}
+}