Fix DontDestroyOnLoadTest

Author: ShadauxCat

com.unity.netcode.gameobjects/Tests/Runtime/TestHelpers/NetcodeIntegrationTest.cs

@@ -1804,6 +1804,9 @@ protected void DestroySceneNetworkObjects()
                         ghostAdapter.prefabReference = null;
                         Object.Destroy(prefabReference);
                         Object.Destroy(ghostAdapter);
+                        // Only normally destroy hybrid-spawned objects.
+                        Object.Destroy(networkObject.gameObject);
+                        continue;
                     }
 
                     // Destroy the GameObject that holds the NetworkObject component

testproject/Assets/Tests/Manual/DontDestroyOnLoad/ObjectToNotDestroyBehaviour.cs

@@ -23,7 +23,7 @@ public uint CurrentPing
         /// <summary>
         /// When enabled, we move ourself to the DontDestroyOnLoad scene
         /// </summary>
-        private void OnEnable()
+        protected override void OnNetworkPreSpawn(ref NetworkManager networkManager)
         {
             DontDestroyOnLoad(this);
         }