[iOS 26] Fix tab bar ghosting when navigating from modal to tabbed Shell content

src/Controls/src/Core/Compatibility/Handlers/Shell/iOS/ShellItemTransition.cs

@@ -1,4 +1,5 @@
 #nullable disable
+using System;
 using System.Threading.Tasks;
 using ObjCRuntime;
 using UIKit;
@@ -14,7 +15,15 @@ public Task Transition(IShellItemRenderer oldRenderer, IShellItemRenderer newRen
 			var newView = newRenderer.ViewController.View;
 
 			oldView.Layer.RemoveAllAnimations();
-			newView.Alpha = 0;
+
+			// On iOS 26+, setting newView.Alpha = 0 before the fade-in causes Liquid Glass
+			// tab bar icons to composite at zero opacity, resulting in missing tab icons.
+			// We skip the initial alpha=0 on iOS 26+, which means there is no fade-in
+			// animation on iOS 26+ — this is intentional to avoid the rendering issue.
+			if (!(OperatingSystem.IsIOSVersionAtLeast(26) || OperatingSystem.IsMacCatalystVersionAtLeast(26)))
+			{
+				newView.Alpha = 0;
+			}
 
 			oldView.Superview.InsertSubviewAbove(newView, oldView);
 

src/Controls/tests/TestCases.HostApp/Issues/Issue34143.cs

@@ -0,0 +1,152 @@
+namespace Maui.Controls.Sample.Issues;
+
+[Issue(IssueTracker.Github, 34143, "Tab bar ghosting issue after navigating from modal via GoToAsync", PlatformAffected.iOS)]
+public class Issue34143 : TestShell
+{
+	protected override void Init()
+	{
+		var homeShellContent = new ShellContent
+		{
+			Title = "Home",
+			Route = "Issue34143Home",
+			ContentTemplate = new DataTemplate(() => new Issue34143MainPage())
+		};
+
+		var tab1 = new Tab
+		{
+			Title = "Tab 1",
+			Route = "Issue34143Tab1",
+			AutomationId = "Issue34143Tab1",
+			Icon = "coffee.png",
+			Items =
+			{
+				new ShellContent
+				{
+					Route = "Issue34143Tab1Content",
+					ContentTemplate = new DataTemplate(() => new Issue34143TabPage("Tab 1 Content"))
+				}
+			}
+		};
+
+		var tab2 = new Tab
+		{
+			Title = "Tab 2",
+			Route = "Issue34143Tab2",
+			AutomationId = "Issue34143Tab2",
+			Icon = "coffee.png",
+			Items =
+			{
+				new ShellContent
+				{
+					Route = "Issue34143Tab2Content",
+					ContentTemplate = new DataTemplate(() => new Issue34143TabPage("Tab 2 Content"))
+				}
+			}
+		};
+
+		var tab3 = new Tab
+		{
+			Title = "Tab 3",
+			Route = "Issue34143Tab3",
+			AutomationId = "Issue34143Tab3",
+			Icon = "coffee.png",
+			Items =
+			{
+				new ShellContent
+				{
+					Route = "Issue34143Tab3Content",
+					ContentTemplate = new DataTemplate(() => new Issue34143TabPage("Tab 3 Content"))
+				}
+			}
+		};
+
+		var tabBar = new TabBar
+		{
+			Items = { tab1, tab2, tab3 }
+		};
+
+		Items.Add(homeShellContent);
+		Items.Add(tabBar);
+	}
+
+	public class Issue34143MainPage : ContentPage
+	{
+		public Issue34143MainPage()
+		{
+			BackgroundColor = Colors.White;
+			Content = new VerticalStackLayout
+			{
+				VerticalOptions = LayoutOptions.Center,
+				HorizontalOptions = LayoutOptions.Center,
+				Children =
+				{
+					new Label
+					{
+						Text = "Home Page",
+						AutomationId = "Issue34143HomeLabel",
+						HorizontalOptions = LayoutOptions.Center
+					},
+					new Button
+					{
+						Text = "Push Modal",
+						AutomationId = "Issue34143PushModal",
+						Command = new Command(async () =>
+							await Shell.Current.Navigation.PushModalAsync(new Issue34143ModalPage()))
+					}
+				}
+			};
+		}
+	}
+
+	public class Issue34143ModalPage : ContentPage
+	{
+		public Issue34143ModalPage()
+		{
+			BackgroundColor = Colors.White;
+			Title = "Modal";
+			Content = new VerticalStackLayout
+			{
+				VerticalOptions = LayoutOptions.Center,
+				HorizontalOptions = LayoutOptions.Center,
+				Children =
+				{
+					new Label
+					{
+						Text = "Modal Page",
+						AutomationId = "Issue34143ModalLabel",
+						HorizontalOptions = LayoutOptions.Center
+					},
+					new Button
+					{
+						Text = "Go to Tab Bar",
+						AutomationId = "Issue34143GoToTabBar",
+						Command = new Command(async () =>
+							await Shell.Current.GoToAsync("//Issue34143Tab1"))
+					}
+				}
+			};
+		}
+	}
+
+	public class Issue34143TabPage : ContentPage
+	{
+		public Issue34143TabPage(string contentText)
+		{
+			BackgroundColor = Colors.White;
+			Content = new VerticalStackLayout
+			{
+				VerticalOptions = LayoutOptions.Center,
+				HorizontalOptions = LayoutOptions.Center,
+				Children =
+				{
+					new Label
+					{
+						Text = contentText,
+						AutomationId = "Issue34143TabContent",
+						HorizontalOptions = LayoutOptions.Center
+					}
+				}
+			};
+		}
+	}
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue34143.cs

@@ -0,0 +1,34 @@
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues;
+
+public class Issue34143 : _IssuesUITest
+{
+	public override string Issue => "Tab bar ghosting issue after navigating from modal via GoToAsync";
+
+	public Issue34143(TestDevice device) : base(device) { }
+
+	[Test]
+	[Category(UITestCategories.Shell)]
+	public void TabBarShouldBeVisibleAfterNavigatingFromModalViaGoToAsync()
+	{
+		// Start on Home page
+		App.WaitForElement("Issue34143PushModal");
+
+		// Push a modal page
+		App.Tap("Issue34143PushModal");
+
+		// Verify modal is shown
+		App.WaitForElement("Issue34143GoToTabBar");
+
+		// Navigate from modal to the tab bar using GoToAsync
+		App.Tap("Issue34143GoToTabBar");
+
+		// Verify we landed on Tab 1 and the tab bar tabs are interactable (not ghosted)
+		App.WaitForElement("Issue34143TabContent");
+
+		VerifyScreenshot();
+	}
+}