With the addition of the start method in the MainMenu script, it breaks the bypass so that the game always starts with Bootstrap scene.
The ClientSingleton check throws the LogError because the instance is null. It ends up pausing playmode in Unity. I see in your video the same happened, but it didn’t pause play. I mean, it’s a minor problem - I was able to unpause and it the scene did change over to the Bootstrap scene in playmode. Did I miss something in scripting?