Test

src/Controls/samples/Controls.Sample.UITests/Issues/Issue19329.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.Issue19329">
+    <VerticalStackLayout x:Name="layout" Margin="75,75,75,75" BackgroundColor="LightGray">
+        <BoxView x:Name="UpperBox" AutomationId="UpperBox" Color="CornflowerBlue" WidthRequest="20" HeightRequest="20"/>
+
+        <Button AutomationId="TapHere" Text="Tap Here">
+            <Button.GestureRecognizers>
+                <TapGestureRecognizer Tapped="OnTapped" />
+            </Button.GestureRecognizers>
+        </Button>
+    </VerticalStackLayout>
+</ContentPage>

src/Controls/samples/Controls.Sample.UITests/Issues/Issue19329.xaml.cs

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+using System;
+using System.Collections.ObjectModel;
+using System.Diagnostics;
+using Microsoft.Maui;
+using Microsoft.Maui.Controls;
+using Microsoft.Maui.Graphics;
+
+namespace Maui.Controls.Sample.Issues
+{
+	[Issue(IssueTracker.Github, 19329, "Pointer gestures should work with relative positions correctly", PlatformAffected.iOS)]
+	public partial class Issue19329 : ContentPage
+	{
+		public Issue19329()
+		{
+			InitializeComponent();
+		}
+
+		private void OnTapped(object sender, TappedEventArgs e)
+		{
+			// Report that the callback was called.
+			layout.Children.Add(new Label { Text = "TapAccepted", AutomationId = "TapAccepted" });
+
+			Point? position = e.GetPosition(relativeTo: UpperBox);
+
+			string result;
+
+			if (position is null)
+			{
+				result = "Error: position is null";
+			}
+			else if (position.Value.X < 75 && position.Value.X < 75)
+			{
+				result = "Success";
+			}
+			else
+			{
+				result = $"Error: relative position is: X={position.Value.X},Y={position.Value.Y}";
+			}
+
+			// Report the result of the test.
+			layout.Children.Add(new Label { Text = result, AutomationId = result });
+		}
+	}
+}

src/Controls/tests/UITests/Tests/Issues/Issue19329.cs

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+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+using System.Drawing;
+
+namespace Microsoft.Maui.AppiumTests.Issues
+{
+	public class Issue19329 : _IssuesUITest
+	{
+		public Issue19329(TestDevice device) : base(device) { }
+
+		public override string Issue => "Pointer gestures should work with relative positions correctly";
+
+		[Test]
+		public void RelativePointerPositionIsComputedCorrectly()
+		{
+			IUIElement button = App.FindElement("TapHere");
+			Rectangle rect = button.GetRect();
+
+			App.TapCoordinates(rect.CenterX(), rect.CenterY());
+			//App.Click(rect.CenterX(), rect.CenterY());
+			App.WaitForElement("TapAccepted");
+			App.WaitForElement("Success");
+		}
+	}
+}