Fixed Stacklayout is not rendered when clip is applied and StackLayout placed child to the Border control in iOS/ Mac platform

src/Controls/tests/TestCases.HostApp/Issues/Issue33241.cs

@@ -0,0 +1,38 @@
+using Microsoft.Maui.Controls.Shapes;
+namespace Maui.Controls.Sample.Issues;
+
+[Issue(IssueTracker.Github, 33241, "StackLayout fails to render content while applying Clip, and the layout is placed inside a Border with Background", PlatformAffected.iOS | PlatformAffected.macOS)]
+public class Issue33241 : ContentPage
+{
+	public Issue33241()
+	{
+		var layout = new VerticalStackLayout();
+		var label = new Label();
+		label.Text =  "The blue box should have a red box inside of it.";
+		label.AutomationId = "Label";
+		layout.Children.Add(label);
+    	var border = new Border
+    	{
+			HeightRequest = 500,
+        	Background = Colors.SkyBlue,
+        	Padding = 10,
+        	Content =
+            new Issue33241_CustomView
+            {
+                Background = Colors.Red,
+                Padding = 10
+            }
+     	};
+		layout.Children.Add(border);
+		Content = layout;
+	}
+}
+
+public class Issue33241_CustomView : StackLayout
+{
+	protected override void OnSizeAllocated(double width, double height)
+	{
+		this.Clip = new RoundRectangleGeometry { Rect = new Rect(0, 0, width, height) };
+		base.OnSizeAllocated(width, height);
+	}
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue33241.cs

@@ -0,0 +1,22 @@
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues;
+
+public class Issue33241 : _IssuesUITest
+{
+		public Issue33241(TestDevice testDevice) : base(testDevice)
+		{
+		}
+
+		public override string Issue => "StackLayout fails to render content while applying Clip, and the layout is placed inside a Border with Background";
+
+		[Test]
+		[Category(UITestCategories.Border)]
+		public void ClippedStackLayoutInsideBorderWithBackgroundRendersCorrectly()
+		{
+			App.WaitForElement("Label");
+			VerifyScreenshot();
+		}
+}

src/Core/src/Platform/iOS/LayerExtensions.cs

@@ -14,6 +14,12 @@ public static void InsertBackgroundLayer(this UIView control, CALayer background
 			{
 				var layer = control.Layer;
 
+				// Ensure the background layer always renders behind subview layers,
+				// even if UIKit reorganizes the sublayer array during layout passes.
+				// Setting ZPosition before insertion is safe — it's a property on the
+				// layer object and only takes effect once added to the sublayer hierarchy.
+				backgroundLayer.ZPosition = -1;
+
 				if (index > -1)
 					layer.InsertSublayer(backgroundLayer, index);
 				else

src/Core/src/Platform/iOS/WrapperView.cs

@@ -99,10 +99,11 @@ public override void LayoutSubviews()
 				return;
 
 			if (_borderView is not null)
+			{
 				BringSubviewToFront(_borderView);
+			}
 
 			var child = subviews[0];
-
 			child.Frame = Bounds;
 
 			if (MaskLayer is not null)