fix vettng test

Author: EmandM

com.unity.netcode.gameobjects/Runtime/Core/NetworkObject.cs

@@ -1222,7 +1222,7 @@ public bool HasOwnershipStatus(OwnershipStatus status)
         /// <summary>
         /// Gets if the object has yet been spawned across the network
         /// </summary>
-        public bool IsSpawned { get; private set; }
+        public bool IsSpawned { get; internal set; }
 
         /// <summary>
         /// Gets if the object is a SceneObject.