[Windows] Fix for the issue with Label text color when resetting from FormattedText.

src/Controls/src/Core/Platform/Windows/Extensions/TextBlockExtensions.cs

@@ -34,7 +34,13 @@ public static void UpdateText(this TextBlock platformControl, Label label)
 					if (label.FormattedText != null)
 						platformControl.UpdateInlines(label);
 					else
+					{
+						if (platformControl.TextHighlighters.Count > 0)
+						{
+							platformControl.TextHighlighters.Clear();
+						}
 						platformControl.Text = TextTransformUtilites.GetTransformedText(label.Text, label.TextTransform);
+					}
 					break;
 			}
 		}

src/Controls/tests/TestCases.HostApp/Issues/Issue24516.xaml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<ContentPage
+    xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+    x:Class="Maui.Controls.Sample.Issues.Issue24516">
+
+  <StackLayout Spacing="20" 
+               VerticalOptions="Center" 
+               HorizontalOptions="Center">
+    <Label x:Name="label"
+           AutomationId="Label"
+           Text="Hello, World!" />
+    <Button AutomationId="Button"
+            Text="Change Text Type"
+            Clicked="OnCounterClicked" />
+  </StackLayout>
+
+</ContentPage>

src/Controls/tests/TestCases.HostApp/Issues/Issue24516.xaml.cs

@@ -0,0 +1,36 @@
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using Microsoft.Maui.Controls.Internals;
+using Microsoft.Maui.Controls.Xaml;
+using Microsoft.Maui.Controls;
+
+
+namespace Maui.Controls.Sample.Issues
+{
+	[Issue(IssueTracker.Github, 24516, "Rendering issue in WinUI when setting Label.FormattedText", PlatformAffected.UWP)]
+	public partial class Issue24516 : ContentPage
+	{
+		int count = 0;
+		public Issue24516()
+		{
+			InitializeComponent();
+		}
+
+		private void OnCounterClicked(object sender, EventArgs e)
+		{
+			count++;
+			if (count % 2 == 0)
+			{
+				label.Text = "Hello, World!";
+			}
+			else
+			{
+				var formattedString = new FormattedString();
+				formattedString.Spans.Add(new Span { Text = "Hello", TextColor = Color.FromRgb(0xB0, 0x0F, 0x50) });
+				formattedString.Spans.Add(new Span { Text = ", World!" });
+				label.FormattedText = formattedString;
+			}
+		}
+	}
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue24516.cs

@@ -0,0 +1,27 @@
+#if !MACCATALYST
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues 
+{
+	public class Issue24516 : _IssuesUITest
+	{
+		public Issue24516(TestDevice testDevice) : base(testDevice)
+		{
+		}
+
+		public override string Issue => "Rendering issue in WinUI when setting Label.FormattedText";
+
+		[Test]
+		[Category(UITestCategories.Label)]
+		public void VerifyLabelTextColorWhenResettingFromFormattedText()
+		{
+			App.WaitForElement("Label");
+			App.Tap("Button");
+			App.Tap("Button");
+			VerifyScreenshot();
+		}
+	}
+}
+#endif