diff --git a/Engine.Core/Serialization/Serializers/UniverseSerializer.cs b/Engine.Core/Serialization/Serializers/UniverseSerializer.cs
index d76258b..9789ba0 100644
--- a/Engine.Core/Serialization/Serializers/UniverseSerializer.cs
+++ b/Engine.Core/Serialization/Serializers/UniverseSerializer.cs
@@ -58,6 +58,17 @@ public class UniverseSerializer : IEngineTypeYamlSerializer
     {
         IUniverse universe = (IUniverse)value!;
 
+        IEnumerable<IUniverseObject> rootUniverseObjects = universe.UniverseObjects
+            .Select(uo =>
+            {
+                IUniverseObject root = uo;
+                while (root.Parent is IUniverseObject parent)
+                    root = parent;
+                return root;
+            })
+            .Where(uo => !uo.GetType().HasAttribute<IgnoreSerializationAttribute>())
+            .Distinct();
+
         emitter.Emit(new MappingStart());
 
         emitter.Emit(new Scalar(nameof(IUniverse.Id)));
@@ -70,7 +81,7 @@ public class UniverseSerializer : IEngineTypeYamlSerializer
         serializer(universe.StateEnable);
 
         emitter.Emit(new Scalar(nameof(IUniverse.UniverseObjects)));
-        serializer(universe.UniverseObjects.Where(uo => !uo.GetType().HasAttribute<IgnoreSerializationAttribute>()));
+        serializer(rootUniverseObjects);
 
         emitter.Emit(new MappingEnd());
     }