Fix regression in C++ objects created from C# code to link managed instance properly

Source/Engine/Scripting/BinaryModule.cpp

@@ -796,12 +796,8 @@ ScriptingObject* ManagedBinaryModule::ManagedObjectSpawn(const ScriptingObjectSp
     // Mark as managed type
     object->Flags |= ObjectFlags::IsManagedType;
 
-    // Initialize managed instance
-    if (params.Managed)
-    {
-        object->SetManagedInstance((MObject*)params.Managed);
-    }
-    else
+    // Initialize managed instance (ScriptingObject ctor copies managed object handle)
+    if (!params.Managed)
     {
         // Invoke managed ctor (to match C++ logic)
         object->CreateManaged();

Source/Engine/Scripting/ScriptingObject.cpp

@@ -89,7 +89,11 @@ void SerializableScriptingObject::Deserialize(DeserializeStream& stream, ISerial
 }
 
 ScriptingObject::ScriptingObject(const SpawnParams& params)
-    : _gcHandle(0)
+#if USE_NETCORE
+    : _gcHandle((MGCHandle)params.Managed)
+#elif !COMPILE_WITHOUT_CSHARP
+    : _gcHandle(params.Managed ? MCore::GCHandle::New(params.Managed) : 0)
+#endif
     , _type(params.Type)
     , _id(params.ID)
 {