Title doesn't visible when set IsVisible to true of ShellContent

src/Controls/src/Core/Handlers/Shell/Windows/ShellFlyoutItemView.cs

@@ -117,7 +117,7 @@ void ShellElementPropertyChanged(object sender, PropertyChangedEventArgs e)
 						fe.Visibility = WVisibility.Visible;
 					}
 				}
-
+				base.MeasureOverride(availableSize);
 				var request = view.Measure(availableSize.Width, availableSize.Height);
 				Clip = new RectangleGeometry { Rect = new WRect(0, 0, request.Width, request.Height) };
 				return request.ToPlatform();

src/Controls/tests/TestCases.HostApp/Issues/Issue19783.cs

@@ -0,0 +1,78 @@
+using System.Collections.ObjectModel;
+using System.Collections.Specialized;
+using System.ComponentModel;
+
+namespace Maui.Controls.Sample.Issues
+{
+
+	[Issue(IssueTracker.Github, 19783, "ShellContent IsVisible=True Does not display Title")]
+	public class Issue19783 : Shell
+	{
+		public Issue19783()
+		{
+			var shellContent = new ShellContent()
+			{
+				ContentTemplate = new DataTemplate(typeof(Issue19783_WelcomePage))
+			};
+			var shellContent2 = new ShellContent()
+			{
+				ContentTemplate = new DataTemplate(typeof(Issue19783_ProfilePage))
+			};
+			this.Items.Add(new FlyoutItem()
+			{
+				Title = "Welcome Page",
+				Items =
+				{
+					shellContent
+				}
+			});
+			this.Items.Add(new FlyoutItem()
+			{
+				Title = "Profile Page",
+				IsVisible = false,
+				Items =
+				{
+					shellContent2
+				}
+			});
+			Button button = new Button();
+			button.Text = "Toggle Profile Page";
+			button.AutomationId = "ToggleProfilePage";
+			button.Clicked += (sender, e) =>
+			{
+				this.Items[1].IsVisible = true;
+			};
+			this.FlyoutFooter = button;
+		}
+	}
+
+	public class Issue19783_WelcomePage : ContentPage
+	{
+		StackLayout stackLayout;
+		public Issue19783_WelcomePage()
+		{
+			Title = "Welcome";
+			stackLayout = new StackLayout();
+			var button = new Button();
+			button.Text = "click to open pane";
+			button.AutomationId = "OpenPane";
+			button.Clicked += (sender, e) =>
+			{
+				Shell.Current.FlyoutIsPresented = true;
+			};
+			var label = new Label { Text = "Welcome to the Shell" };
+			stackLayout.Children.Add(label);
+			stackLayout.Children.Add(button);
+			Content = stackLayout;
+		}
+	}
+
+	public class Issue19783_ProfilePage : ContentPage
+	{
+		public Issue19783_ProfilePage()
+		{
+			Title = "Profile";
+			Content = new Label { Text = "Profile" };
+		}
+	}
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue19783.cs

@@ -0,0 +1,24 @@
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues
+{
+	public class Issue19783 : _IssuesUITest
+	{
+		public Issue19783(TestDevice device) : base(device) { }
+
+		public override string Issue => "ShellContent IsVisible=True Does not display Title";
+
+		[Test]
+		[Category(UITestCategories.Shell)]
+		public void Issue19783Shell()
+		{
+			App.WaitForElement("click to open pane");
+			App.Tap("OpenPane");
+			App.WaitForElement("Toggle Profile Page");
+			App.Tap("ToggleProfilePage");
+			App.WaitForElement("Profile Page");
+		}
+	}
+}