XPath throws exceptions with namespaced xml tags about anglesharp.xpath HOT 4 CLOSED

using System;
using AngleSharp.Dom;
using AngleSharp.XPath;
using AngleSharp.Xml.Parser;
					
public class Program
{
	public static string Xml = "<?xml version=\"1.0\" encoding=\"utf-8\" ?><urlset xmlns=\"http://www.sitemaps.org/schemas/sitemap/0.9\" xmlns:xhtml=\"http://www.w3.org/1999/xhtml\"><url><loc>https://www.test.com/de/accounts/profile</loc><xhtml:link rel=\"alternate\" hreflang=\"fr\" href=\"https://www.test.com/fr/accounts/profile\" /><xhtml:link rel=\"alternate\" hreflang=\"en\" href=\"https://www.test.com/en/accounts/profile\" /><xhtml:link rel=\"alternate\" hreflang=\"it\" href=\"https://www.test.com/it/accounts/profile\" /><changefreq>weekly</changefreq><priority>0.4</priority></url></urlset>";
	
	public static void Main()
	{
		var parser = new XmlParser();
		var doc = parser.ParseDocument(Xml);
		var nodeList = doc.DocumentElement.SelectNodes("//urlset/url/xhtml:link");
		foreach (var entry in nodeList)
			Console.WriteLine(string.Join(",", entry.TextContent));
		
	}
}

[Test]
public void SelectSingleNode_IgnoreNamespaces_ShouldReturnNode()
{
    // Arrange
    var xml = "<?xml version=\"1.0\" encoding=\"utf-8\" ?><urlset xmlns=\"http://www.sitemaps.org/schemas/sitemap/0.9\" xmlns:xhtml=\"http://www.w3.org/1999/xhtml\"><url><loc>https://www.test.com/de/accounts/profile</loc><xhtml:link rel=\"alternate\" hreflang=\"fr\" href=\"https://www.test.com/fr/accounts/profile\" /><xhtml:link rel=\"alternate\" hreflang=\"en\" href=\"https://www.test.com/en/accounts/profile\" /><xhtml:link rel=\"alternate\" hreflang=\"it\" href=\"https://www.test.com/it/accounts/profile\" /><changefreq>weekly</changefreq><priority>0.4</priority></url></urlset>";
    var parser = new XmlParser();
    var doc = parser.ParseDocument(xml);

    // Act
    var node = doc.DocumentElement.SelectSingleNode("/urlset/url/link");

    // Assert
    Assert.IsNotNull(node);
    Assert.That(node.NodeName, Is.EqualTo("xhtml:link"));
}

[Test]
public void SelectSingleNode_DontIgnoreNamespaces_ShouldReturnNode()
{
    // Arrange
    var xml = "<?xml version=\"1.0\" encoding=\"utf-8\" ?><urlset xmlns=\"http://www.sitemaps.org/schemas/sitemap/0.9\" xmlns:xhtml=\"http://www.w3.org/1999/xhtml\"><url><loc>https://www.test.com/de/accounts/profile</loc><xhtml:link rel=\"alternate\" hreflang=\"fr\" href=\"https://www.test.com/fr/accounts/profile\" /><xhtml:link rel=\"alternate\" hreflang=\"en\" href=\"https://www.test.com/en/accounts/profile\" /><xhtml:link rel=\"alternate\" hreflang=\"it\" href=\"https://www.test.com/it/accounts/profile\" /><changefreq>weekly</changefreq><priority>0.4</priority></url></urlset>";
    var parser = new XmlParser();
    var doc = parser.ParseDocument(xml);
    var namespaceManager = new XmlNamespaceManager(new NameTable());

    namespaceManager.AddNamespace("xhtml", "http://www.w3.org/1999/xhtml");
    namespaceManager.AddNamespace("d", "http://www.sitemaps.org/schemas/sitemap/0.9");

    // Act
    var node = doc.DocumentElement.SelectSingleNode("/d:urlset/d:url/xhtml:link", namespaceManager, false);

    // Assert
    Assert.IsNotNull(node);
    Assert.That(node.NodeName, Is.EqualTo("xhtml:link"));
}