diff --git a/test/ExtendedXmlSerializer.Tests.ReportedIssues/Issue565Tests_Extended.cs b/test/ExtendedXmlSerializer.Tests.ReportedIssues/Issue565Tests_Extended.cs
new file mode 100644
index 00000000..4f5a18d4
--- /dev/null
+++ b/test/ExtendedXmlSerializer.Tests.ReportedIssues/Issue565Tests_Extended.cs
@@ -0,0 +1,40 @@
+using ExtendedXmlSerializer.Configuration;
+using ExtendedXmlSerializer.Tests.ReportedIssues.Support;
+using FluentAssertions;
+using System.Collections.Generic;
+using Xunit;
+
+namespace ExtendedXmlSerializer.Tests.ReportedIssues
+{
+	public sealed class Issue565Tests_Extended
+	{
+		[Fact]
+		public void Verify()
+		{
+			var subject  = new ConfigurationContainer().Create().ForTesting();
+			var instance = new Store
+			{
+				[new byte[2]] = "First",
+				[new byte[3]] = "Second",
+				[new byte[4]] = "Third"
+			};
+			subject.Cycle(instance).Should().BeEquivalentTo(instance);
+		}
+
+		sealed class Store : Dictionary<byte[], string>
+		{
+			public Store() : base(Issue565Tests_Extended.Comparer.Instance) {}
+		}
+
+		sealed class Comparer : EqualityComparer<byte[]>
+		{
+			public static Comparer Instance { get; } = new();
+
+			Comparer() {}
+
+			public override bool Equals(byte[] x, byte[] y) => x.Length == y.Length;
+
+			public override int GetHashCode(byte[] obj) => obj.Length.GetHashCode();
+		}
+	}
+}
diff --git a/test/ExtendedXmlSerializer.Tests.ReportedIssues/Issue565Tests_Extended_II.cs b/test/ExtendedXmlSerializer.Tests.ReportedIssues/Issue565Tests_Extended_II.cs
new file mode 100644
index 00000000..45242f8d
--- /dev/null
+++ b/test/ExtendedXmlSerializer.Tests.ReportedIssues/Issue565Tests_Extended_II.cs
@@ -0,0 +1,58 @@
+using ExtendedXmlSerializer.Configuration;
+using ExtendedXmlSerializer.Tests.ReportedIssues.Support;
+using FluentAssertions;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Xunit;
+
+namespace ExtendedXmlSerializer.Tests.ReportedIssues
+{
+	public sealed class Issue565Tests_Extended_II
+	{
+		[Fact]
+		public void Verify()
+		{
+			List<TestSerialization> instance = new List<TestSerialization>();
+			for (int i = 0; i < 2000; i++)
+			{
+				var newElement = new TestSerialization();
+				if (i % 2 == 0)
+				{
+					newElement.MyString  = "**********";
+					newElement.MyDouble  = Double.MaxValue;
+					newElement.MyBool    = true;
+					newElement.MyInteger = i;
+				}
+				else
+				{
+					newElement.MyString  = "----------";
+					newElement.MyDouble  = Double.MinValue;
+					newElement.MyBool    = false;
+					newElement.MyInteger = i;
+				}
+				instance.Add(newElement);
+			}
+
+			var serializer = new ConfigurationContainer().EnableImplicitTyping(typeof(List<TestSerialization>))
+			                                             .Create();
+
+			var cycle = serializer.Cycle(instance);
+			cycle.Should().BeEquivalentTo(instance);
+			cycle[0].Should().BeEquivalentTo(instance[0]);
+			cycle.Last().Should().BeEquivalentTo(instance.Last());
+		}
+
+		[Serializable]
+		public class TestSerialization
+		{
+			public string MyString { get; set; }
+
+			public bool MyBool { get; set; }
+
+			public double MyDouble { get; set; }
+
+			public int MyInteger { get; set; }
+		}
+	}
+}
diff --git a/test/ExtendedXmlSerializer.Tests.ReportedIssues/Issue565Tests_Extended_III.cs b/test/ExtendedXmlSerializer.Tests.ReportedIssues/Issue565Tests_Extended_III.cs
new file mode 100644
index 00000000..a69d533d
--- /dev/null
+++ b/test/ExtendedXmlSerializer.Tests.ReportedIssues/Issue565Tests_Extended_III.cs
@@ -0,0 +1,112 @@
+using ExtendedXmlSerializer.Configuration;
+using ExtendedXmlSerializer.Tests.ReportedIssues.Support;
+using FluentAssertions;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using Xunit;
+
+namespace ExtendedXmlSerializer.Tests.ReportedIssues
+{
+	public sealed class Issue565Tests_Extended_III
+	{
+		[Fact]
+		public void Verify()
+		{
+			var instances = new[]
+			{
+				new Model
+				{
+					Key = new List<byte[]>
+					{
+						Encoding.UTF8.GetBytes("Hello"),
+						Encoding.UTF8.GetBytes("World"),
+					},
+					Message = "First"
+				},
+				new Model
+				{
+					Key = new List<byte[]>
+					{
+						Encoding.UTF8.GetBytes("Hello1"),
+						Encoding.UTF8.GetBytes("World1"),
+					},
+					Message = "Second"
+				},
+				new Model
+				{
+					Key = new List<byte[]>
+					{
+						Encoding.UTF8.GetBytes("Hello2"),
+						Encoding.UTF8.GetBytes("World2"),
+					},
+					Message = "Third"
+				},
+				new Model
+				{
+					Key = new List<byte[]>
+					{
+						Encoding.UTF8.GetBytes("Hello3"),
+						Encoding.UTF8.GetBytes("World3"),
+					},
+					Message = "Fourth"
+				},
+				new Model
+				{
+					Key = new List<byte[]>
+					{
+						Encoding.UTF8.GetBytes("Hello4"),
+						Encoding.UTF8.GetBytes("World4"),
+					},
+					Message = "Fifth"
+				},
+				new Model
+				{
+					Key = new List<byte[]>
+					{
+						Encoding.UTF8.GetBytes("Hello5"),
+						Encoding.UTF8.GetBytes("World5"),
+					},
+					Message = "Sixth"
+				}
+			};
+			var instance = new Store();
+			foreach (var model in instances)
+			{
+				instance.Add(model.Key, model);
+			}
+			var subject  = new ConfigurationContainer().EnableImplicitTyping(instance.GetType()).Create().ForTesting();
+			var cycle    = subject.Cycle(instance);
+			cycle.Values.Should().BeEquivalentTo(instance.Values);
+			cycle.Should().BeEquivalentTo(instance);
+			cycle.Count.Should().Be(instance.Count);
+		}
+
+		public sealed class Model
+		{
+			public List<byte[]> Key { get; set; }
+
+			public string Message { get; set; }
+		}
+
+		sealed class Store : Dictionary<List<byte[]>, Model>
+		{
+			public Store() : base(Issue565Tests_Extended_III.Comparer.Instance) {}
+		}
+
+		sealed class Comparer : EqualityComparer<List<byte[]>>
+		{
+			public static Comparer Instance { get; } = new();
+
+			Comparer() {}
+
+			public override bool Equals(List<byte[]> x, List<byte[]> y)
+				=> (x != null ? string.Join(string.Empty, x.Select(Encoding.UTF8.GetString)) : string.Empty)
+				   ==
+				   (y != null ? string.Join(string.Empty, y.Select(Encoding.UTF8.GetString)) : string.Empty);
+
+			public override int GetHashCode(List<byte[]> obj)
+				=> string.Join(string.Empty, obj.Select(Encoding.UTF8.GetString)).GetHashCode();
+		}
+	}
+}
\ No newline at end of file