Bug Client can't reconnect

Hello,
I have a problem with Netcode for gameobjects.
When a client first joins a Server everything works fine, but if he leaves and tries to reconnect "NetworkManager.Singleton.ConnectedClientsIds.Count" will say there a 2 clients but the client wont be taken to the new scene as he normaly would, instead he stays in the main scene. I also get an error stating:
"MissingReferenceException: The object of type 'NetworkObject' has been destroyed but you are still trying to access it."
but all the code executet befor is also in netcode so I dont think it is my code. I have attached a file with that error and everything that follows after that.
When I restart the host the client can join again.
This really confuses me as there isnt even a player prefab or anything i spawn. All Objects are spawned and owned by the host. I also attached a file with my NetworkManager settings.
When I get thrown to the main menu there would be 2 NetworkManager so I attached this script:

    static NetworkManagerSingleton instance;



    public void Awake()

    {

        if(instance == null)

            instance = this;

        else

        {

            Destroy(gameObject);

            return;

        }



        DontDestroyOnLoad(gameObject);

    }

I use "NetworkManager.Singleton.Shutdown();" to close the previous connection.
This is really messing things up, if you have any idea it would be great. I am probably just blind to something obvious.

 

Just to clarify I believe this is a bug as all the errors point to netcode not my scripts, but my debug knowledge is also quite limited.

 

Hello @cunibon,
have you found a solution for this?