Just a little thing I noticed - There are some editor assets that are creating new LocalLobbies in edit mode. I'll have to root out all of them, but here's one.

Assets/Scripts/Game/GameManager.cs

         {
             if (type == MessageType.CreateLobbyRequest)
             {
-                var createLobbyData = (LocalLobby)msg;
+                LocalLobby.LobbyData createLobbyData = (LocalLobby.LobbyData)msg;
                 LobbyAsyncRequests.Instance.CreateLobbyAsync(createLobbyData.LobbyName, createLobbyData.MaxPlayerCount, createLobbyData.Private, m_localUser, (r) =>
                     {   lobby.ToLocalLobby.Convert(r, m_localLobby);
                         OnCreatedLobby();

Assets/Scripts/UI/CreateMenuUI.cs

     /// </summary>
     public class CreateMenuUI : UIPanelBase
     {
-        [SerializeField]
-        LocalLobby m_ServerRequestData = new LocalLobby { LobbyName = "New Lobby", MaxPlayerCount = 4 };
+        private LocalLobby.LobbyData m_ServerRequestData = new LocalLobby.LobbyData{ LobbyName = "New Lobby", MaxPlayerCount = 4 };
 
         public override void Start()
         {