fix: universe object registration logic order fixed

Engine.Core/Universe.cs

@@ -63,17 +63,17 @@ public class Universe : BaseEntity, IUniverse
         if (!universeObject.Initialize())
             throw new Exception($"{universeObject.Name} can't be initialized");
 
-        for (int i = 0; i < universeObject.Children.Count; i++)
-            Register(universeObject.Children[i]);
-
-        _universeObjects.Add(universeObject);
-
         if (universeObject.Parent == null)
             universeObject.Parent = Root;
 
+        _universeObjects.Add(universeObject);
+
         if (!universeObject.EnterUniverse(this))
             throw new Exception($"{universeObject.Name} can't enter the universe");
 
+        for (int i = 0; i < universeObject.Children.Count; i++)
+            Register(universeObject.Children[i]);
+
         OnUniverseObjectRegistered?.Invoke(this, new(universeObject));
     }