Added a UITest

Author: kubaflo

src/Controls/tests/TestCases.HostApp/Issues/Issue25946.xaml

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+<?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.Issue25946">
+    <Grid RowDefinitions="*,Auto">
+        <CarouselView x:Name="collectionView">
+            <CarouselView.ItemsSource>
+                <x:Array Type="{x:Type x:String}">
+                    <x:String>Item1</x:String>
+                    <x:String>Item2</x:String>
+                    <x:String>Item3</x:String>
+                </x:Array>
+            </CarouselView.ItemsSource>
+            <CarouselView.ItemTemplate>
+                <DataTemplate>
+                    <ContentView>
+                        <VerticalStackLayout HorizontalOptions="Center"
+                                             WidthRequest="200"
+                                             HeightRequest="200"
+                                             Background="Green">
+                            <Label Text="{Binding .}"/>
+                            <Label Text="{Binding .}"
+                                   TextType="Html"/>
+                        </VerticalStackLayout>
+                    </ContentView>
+                </DataTemplate>
+            </CarouselView.ItemTemplate>
+        </CarouselView>
+        <Button Grid.Row="1"
+                AutomationId="btnScrollToLastItem"
+                Clicked="ButtonClicked"
+                Text="Scroll to last Item"/>
+    </Grid>
+</ContentPage>

src/Controls/tests/TestCases.HostApp/Issues/Issue25946.xaml.cs

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+namespace Maui.Controls.Sample.Issues
+{
+	[Issue(IssueTracker.Github, 25946, "App crashes on iOS 18 when placing html label in carousel view with > 2 elements", PlatformAffected.iOS)]
+	public partial class Issue25946 : ContentPage
+	{
+		public Issue25946()
+		{
+			InitializeComponent();
+		}
+
+		void ButtonClicked(object sender, EventArgs e)
+		{
+			collectionView.ScrollTo(1, animate: true);
+		}
+	}
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue25946.cs

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+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues
+{
+	public class Issue25946 : _IssuesUITest
+	{
+		public Issue25946(TestDevice testDevice) : base(testDevice)
+		{
+		}
+
+		public override string Issue => "App crashes on iOS 18 when placing html label in carousel view with > 2 elements";
+
+		[Test]
+		[Category(UITestCategories.CarouselView)]
+		[Category(UITestCategories.Label)]
+		public void AppShouldNotCrash()
+		{
+			App.WaitForElement("btnScrollToLastItem");
+			App.Click("btnScrollToLastItem");
+
+			App.WaitForElement("Item2");
+		}
+	}
+}