fix(xBind): [Wasm] Fix invalid internal ElementStub state

Author: jeromelaban

src/Uno.UI.RuntimeTests/Tests/Windows_UI_Xaml/Given_xLoad.cs

@@ -47,6 +47,15 @@ public async Task When_xLoad_xBind()
 			sut.IsLoad = false;
 
 			Assert.IsFalse((parent.Child as ElementStub).Load);
+
+			sut.IsLoad = true;
+
+			Assert.IsNotNull(sut.LoadBorder);
+			parent = sut.LoadBorder.Parent as Border;
+
+			sut.IsLoad = false;
+
+			Assert.IsFalse((parent.Child as ElementStub).Load);
 		}
 
 		[TestMethod]

src/Uno.UI/UI/Xaml/ElementStub.cs

@@ -3,6 +3,8 @@
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Text;
+using Uno.Extensions;
+using Uno.Logging;
 using Uno.UI;
 using Uno.UI.DataBinding;
 
@@ -177,6 +179,11 @@ private void RaiseMaterializing()
 
 		private void Materialize(bool isVisibilityChanged)
 		{
+			if(this.Log().IsEnabled(Microsoft.Extensions.Logging.LogLevel.Debug))
+			{
+				this.Log().Debug($"ElementStub.Materialize(isVibilityChanged: {isVisibilityChanged})");
+			}
+
 			if (_content == null && !_isMaterializing)
 			{
 #if !HAS_EXPENSIVE_TRYFINALLY // Try/finally incurs a very large performance hit in mono-wasm - https://github.com/dotnet/runtime/issues/50783
@@ -203,15 +210,20 @@ private void Materialize(bool isVisibilityChanged)
 #if !HAS_EXPENSIVE_TRYFINALLY // Try/finally incurs a very large performance hit in mono-wasm - https://github.com/dotnet/runtime/issues/50783
 				}
 				finally
+#endif
 				{
 					_isMaterializing = false;
 				}
-#endif
 			}
 		}
 
 		private void Dematerialize()
 		{
+			if (this.Log().IsEnabled(Microsoft.Extensions.Logging.LogLevel.Debug))
+			{
+				this.Log().Debug($"ElementStub.Dematerialize()");
+			}
+
 			if (_content != null)
 			{
 				var newView = SwapViews(oldView: (FrameworkElement)_content, newViewProvider: () => this as View);