fix: NetcodeIntegrationTest updates and fixes

com.unity.netcode.gameobjects/Runtime/Messaging/Messages/ConnectionApprovedMessage.cs

@@ -273,10 +273,10 @@ public void Handle(ref NetworkContext context)
             // Stop the client-side approval timeout coroutine since we are approved.
             networkManager.ConnectionManager.StopClientApprovalCoroutine();
 
-            networkManager.ConnectionManager.ConnectedClientIds.Clear();
             foreach (var clientId in ConnectedClientIds)
             {
-                if (!networkManager.ConnectionManager.ConnectedClientIds.Contains(clientId))
+                // If there is any disconnect between the connection sequence of Ids vs ConnectedClients, then add the client.
+                if (!networkManager.ConnectionManager.ConnectedClientIds.Contains(clientId) || !networkManager.ConnectionManager.ConnectedClients.ContainsKey(clientId))
                 {
                     networkManager.ConnectionManager.AddClient(clientId);
                 }

com.unity.netcode.gameobjects/Runtime/SceneManagement/NetworkSceneManager.cs

@@ -2595,30 +2595,26 @@ private void HandleSessionOwnerEvent(uint sceneEventId, ulong clientId)
                 case SceneEventType.SynchronizeComplete:
                     {
                         // At this point the client is considered fully "connected"
-                        if ((NetworkManager.DistributedAuthorityMode && NetworkManager.LocalClient.IsSessionOwner) || !NetworkManager.DistributedAuthorityMode)
+                        // Make sure we have a NetworkClient for this synchronized client
+                        if (!NetworkManager.ConnectedClients.ContainsKey(clientId))
                         {
-                            // Notify the local server that a client has finished synchronizing
-                            OnSceneEvent?.Invoke(new SceneEvent()
-                            {
-                                SceneEventType = sceneEventData.SceneEventType,
-                                SceneName = string.Empty,
-                                ClientId = clientId
-                            });
-                            if (NetworkManager.ConnectedClients.ContainsKey(clientId))
-                            {
-                                NetworkManager.ConnectedClients[clientId].IsConnected = true;
-                            }
+                            NetworkManager.ConnectionManager.AddClient(clientId);
                         }
-                        else
+                        // Mark this client as being connected
+                        NetworkManager.ConnectedClients[clientId].IsConnected = true;
+
+                        // Notify the local server that a client has finished synchronizing
+                        OnSceneEvent?.Invoke(new SceneEvent()
                         {
-                            // Notify the local server that a client has finished synchronizing
-                            OnSceneEvent?.Invoke(new SceneEvent()
-                            {
-                                SceneEventType = sceneEventData.SceneEventType,
-                                SceneName = string.Empty,
-                                ClientId = clientId
-                            });
+                            SceneEventType = sceneEventData.SceneEventType,
+                            SceneName = string.Empty,
+                            ClientId = clientId
+                        });
 
+                        // For non-authority clients in a distributed authority session, we show hidden objects,
+                        // we distribute NetworkObjects, and then we end the scene event.
+                        if (NetworkManager.DistributedAuthorityMode && !NetworkManager.LocalClient.IsSessionOwner)
+                        {
                             // Show any NetworkObjects that are:
                             // - Hidden from the session owner
                             // - Owned by this client

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

@@ -831,7 +831,7 @@ internal NetworkObject GetNetworkObjectToSpawn(uint globalObjectIdHash, ulong ow
                 {
                     if (NetworkLog.CurrentLogLevel <= LogLevel.Error)
                     {
-                        NetworkLog.LogError($"Failed to create object locally. [{nameof(globalObjectIdHash)}={globalObjectIdHash}]. {nameof(NetworkPrefab)} could not be found. Is the prefab registered with {nameof(NetworkManager)}?");
+                        NetworkLog.LogError($"Failed to create object locally. [{nameof(globalObjectIdHash)}={globalObjectIdHash}]. {nameof(NetworkPrefab)} could not be found. Is the prefab registered with {NetworkManager.name}?");
                     }
                 }
                 else