KeyNotFoundException after host leaves and rehosts

I have been stuck for 2 full days on this super simple use case which I simply can't seem to figure out what I am doing wrong.
When I try to fire any ClientRCP after rehosting I get a KeyNotFoundException. The cause seems to be the observers in any of the NetworkObjects that I have in my scene. When I open the tab I get spammed with the exact same error as you can see in the image. This only occurs when the host is the first to use NetworkManager.Singleton.Shutdown();

When the client uses the shutdown() first which refires Leave() to make everyone leave then I can rehost without any issues.

Code (CSharp):

1. public void Leave()
2.     {
3.         Debug.LogError("DISCONNECTED: " + NetworkManager.Singleton.LocalClientId);
4.         NetworkManager.Singleton.Shutdown();
5.  
6.         if (NetworkManager.Singleton.IsHost)
7.             NetworkManager.Singleton.ConnectionApprovalCallback -= ApprovalCheck;
8.  
9.         rPSManager.OpenJoinUI();
10.         leaveButton.SetActive(false);
11.     }
12.  
13. public void HandleClientDisconnect(ulong clientId)
14.     {
15.         Leave(); //Force all other players to leave and cut connection
16.     }

Or is this a very wrong way to handle disconnections?

 

Solution:


Context: use this if you don't change scenes unlike in the Boss Room default code example. The NetworkObjects don't remove the client ids properly from their observers when the host calls a shutdown. Hence you gotta disconnect all users first except the host and thereafter disconnect the host through shutdown so the NetworkObjects don't get destroyed en you can make host a new match