try things

Author: EmandM

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

@@ -2060,6 +2060,13 @@ internal void InvokeOwnershipChanged(ulong previous, ulong next)
 
         internal void InvokeBehaviourOnNetworkObjectParentChanged(NetworkObject parentNetworkObject)
         {
+            if (NetworkManagerOwner == null)
+            {
+#if TEST_NO_SINGLETON
+                    Debug.LogError("NetworkManagerOwner should be set! Setting owner to NetworkManager.Singleton");
+#endif
+                NetworkManagerOwner = NetworkManager.Singleton;
+            }
             for (int i = 0; i < ChildNetworkBehaviours.Count; i++)
             {
                 // Invoke internal notification
@@ -2288,6 +2295,13 @@ private void OnTransformParentChanged()
 
             if (!IsSpawned)
             {
+                if (NetworkManagerOwner == null)
+                {
+#if TEST_NO_SINGLETON
+                    Debug.LogError("NetworkManagerOwner should be set! Setting owner to NetworkManager.Singleton");
+#endif
+                    NetworkManagerOwner = NetworkManager;
+                }
                 AuthorityAppliedParenting = false;
                 // and we are removing the parent, then go ahead and allow parenting to occur
                 if (transform.parent == null)
@@ -2632,7 +2646,9 @@ private List<NetworkBehaviour> BuildChildBehavioursList()
         {
             if (NetworkManagerOwner == null)
             {
+#if TEST_NO_SINGLETON
                 Debug.LogError("NetworkManagerOwner should be set! Setting owner to NetworkManager.Singleton");
+#endif
                 NetworkManagerOwner = NetworkManager.Singleton;
             }
 
@@ -2759,6 +2775,15 @@ internal static void VerifyParentingStatus()
         /// </returns>
         public ushort GetNetworkBehaviourOrderIndex(NetworkBehaviour instance)
         {
+            if (!IsSpawned)
+            {
+                if (NetworkLog.CurrentLogLevel <= LogLevel.Developer)
+                {
+                    Debug.LogWarning($"{nameof(NetworkObject)} is not spawned yet. Cannot get index of NetworkBehaviour.");
+                }
+                return 0;
+            }
+
             // read the cached index, and verify it first
             if (instance.NetworkBehaviourId < ChildNetworkBehaviours.Count)
             {
@@ -2780,6 +2805,15 @@ public ushort GetNetworkBehaviourOrderIndex(NetworkBehaviour instance)
         /// <returns>The <see cref="NetworkBehaviour"/> at the ordered index value or null if it does not exist.</returns>
         public NetworkBehaviour GetNetworkBehaviourAtOrderIndex(ushort index)
         {
+            if (!IsSpawned)
+            {
+                if (NetworkLog.CurrentLogLevel <= LogLevel.Developer)
+                {
+                    Debug.LogWarning($"{nameof(NetworkObject)} is not spawned yet. Cannot get NetworkBehaviour at index.");
+                }
+                return null;
+            }
+
             if (index >= ChildNetworkBehaviours.Count)
             {
                 if (NetworkLog.CurrentLogLevel <= LogLevel.Error)

com.unity.netcode.gameobjects/Runtime/Spawning/NetworkSpawnManager.cs

@@ -783,7 +783,7 @@ internal NetworkObject InstantiateAndSpawnNoParameterChecks(NetworkObject networ
                 return null;
             }
 
-            networkObject.NetworkManagerOwner = networkManager;
+            networkObject.NetworkManagerOwner = NetworkManager;
             networkObject.IsPlayerObject = isPlayerObject;
             networkObject.transform.SetPositionAndRotation(position, rotation);
             // If spawning as a player, then invoke SpawnAsPlayerObject
@@ -1052,6 +1052,10 @@ internal void SpawnNetworkObjectLocally(NetworkObject networkObject, NetworkMana
                 }
             }
             // Invoke NetworkBehaviour.OnPreSpawn methods
+            if (networkObject.NetworkManagerOwner != networkManager || NetworkManager != networkManager)
+            {
+                Debug.LogWarning("overriding network manager");
+            }
             networkObject.NetworkManagerOwner = networkManager;
             networkObject.InvokeBehaviourNetworkPreSpawn();
 
@@ -1469,6 +1473,10 @@ internal void ServerSpawnSceneObjectsOnStartSweep()
             var networkObjectsToSpawn = new List<NetworkObject>();
             for (int i = 0; i < networkObjects.Length; i++)
             {
+                if (networkObjects[i].NetworkManager != NetworkManager)
+                {
+                    Debug.LogWarning("Well this is strange");
+                }
                 // This used to be two loops.
                 // The first added all NetworkObjects to a list and the second spawned all NetworkObjects in the list.
                 // Now, a parent will set its children's IsSceneObject value when spawned, so we check for null or for true.

com.unity.netcode.gameobjects/Tests/Runtime/TestHelpers/Components/ObjectNameIdentifier.cs

@@ -108,7 +108,10 @@ public override void OnDestroy()
                 DeRegisterNetworkObject();
                 // This is required otherwise it will try to continue to update the NetworkBehaviour even if
                 // it has been destroyed (most likely integration test specific)
-                m_NetworkObject.ChildNetworkBehaviours?.Remove(this);
+                if (m_NetworkObject.ChildNetworkBehaviours != null && m_NetworkObject.ChildNetworkBehaviours.Contains(this))
+                {
+                    NetworkObject.ChildNetworkBehaviours.Remove(this);
+                }
                 m_NetworkObject = null;
             }
             base.OnDestroy();