diff --git a/AyCode.Core.Tests/Serialization/AcBinarySerializerIIdReferenceTests.cs b/AyCode.Core.Tests/Serialization/AcBinarySerializerIIdReferenceTests.cs
index da2cdea..ddb7c32 100644
--- a/AyCode.Core.Tests/Serialization/AcBinarySerializerIIdReferenceTests.cs
+++ b/AyCode.Core.Tests/Serialization/AcBinarySerializerIIdReferenceTests.cs
@@ -124,7 +124,8 @@ public class AcBinarySerializerIIdReferenceTests
             var options = new AcBinarySerializerOptions
             {
                 ReferenceHandling = mode,
-                UseGeneratedCode = useSgen
+                UseGeneratedCode = useSgen,
+                UseMetadata = useMeta
             };
 
             Console.WriteLine($"\n========== ReferenceHandling: {options.ReferenceHandling}, UseSgen: {options.UseGeneratedCode}, UseMeta: {options.UseMetadata} ==========");
@@ -138,6 +139,10 @@ public class AcBinarySerializerIIdReferenceTests
             Console.WriteLine($"Binary size: {binary.Length} bytes");
             Console.WriteLine($"ObjectRef count: {objectRefCount}");
 
+            Assert.IsNotNull(result, $"[{mode}] Deserialized result is null");
+            Assert.IsNotNull(result.Parent);
+            Assert.IsNotNull(result.Owner);
+
             // Assert based on mode
             switch (mode)
             {
@@ -152,6 +157,8 @@ public class AcBinarySerializerIIdReferenceTests
                     // IId types should have reference identity
                     Assert.AreSame(result.PrimaryTag, result.Items[0].Tag, $"[{mode}] Tag reference identity failed");
                     Assert.AreSame(result.Owner, result.Items[0].Assignee, $"[{mode}] User reference identity failed");
+                    Assert.AreSame(result, result.Items[1].ParentOrder);
+                    Assert.AreSame(result.Parent, result.Items[1]);
                     break;
                     
                 case ReferenceHandlingMode.All:
@@ -159,14 +166,16 @@ public class AcBinarySerializerIIdReferenceTests
                     Assert.IsTrue(objectRefCount >= 4, $"[{mode}] Expected at least 4 ObjectRefs, found {objectRefCount}");
                     Assert.AreSame(result.PrimaryTag, result.Items[0].Tag, $"[{mode}] Tag reference identity failed");
                     Assert.AreSame(result.Owner, result.Items[0].Assignee, $"[{mode}] User reference identity failed");
+                    
+                    Assert.AreSame(result, result.Items[1].ParentOrder);
+                    Assert.AreSame(result.Parent, result.Items[1]);
+
                     // Non-IId should also have reference identity in All mode
-                    Assert.AreSame(result.Owner.Preferences, result.Items[0].Assignee.Preferences, 
-                        $"[{mode}] UserPreferences reference identity failed - Non-IId should work in All mode!");
+                    Assert.AreSame(result.Owner.Preferences, result.Items[0].Assignee.Preferences, $"[{mode}] UserPreferences reference identity failed - Non-IId should work in All mode!");
                     break;
             }
 
             // Data integrity - always check
-            Assert.IsNotNull(result, $"[{mode}] Deserialized result is null");
             Assert.IsNotNull(result.PrimaryTag, $"[{mode}] PrimaryTag is null");
             Assert.AreEqual(1, result.PrimaryTag.Id, $"[{mode}] PrimaryTag.Id incorrect");
             Assert.AreEqual("ImportantTag", result.PrimaryTag.Name, $"[{mode}] PrimaryTag.Name incorrect");
diff --git a/AyCode.Core/Serializers/Binaries/AcBinarySerializerOptions.cs b/AyCode.Core/Serializers/Binaries/AcBinarySerializerOptions.cs
index 7d6d1a3..6b01f75 100644
--- a/AyCode.Core/Serializers/Binaries/AcBinarySerializerOptions.cs
+++ b/AyCode.Core/Serializers/Binaries/AcBinarySerializerOptions.cs
@@ -82,9 +82,9 @@ public sealed class AcBinarySerializerOptions : AcSerializerOptions
     /// allowing the deserializer to match properties by name between different types.
     /// Default: false (no overhead)
     /// </summary>
-    public bool UseMetadata { get; set; } = true;
+    public bool UseMetadata { get; set; } = false;
 
-    public bool UseGeneratedCode { get; set; } = false;
+    public bool UseGeneratedCode { get; set; } = true;
 
     /// <summary>
     /// Controls how string interning is applied during serialization.