This bug can be triggered by two methods which I know of:
Method A)
1) Random disconnect for game only
2) Either connection lost timer runs out or you exit to role assignemtn
3) Try to click disconnect in role assignment
4) Frozen game that cannot be terminated by task manager etc.
Method B)
1) Stop/Restart the server the client is connected to
2) Either connection lost timer runs out or you exit to role assignemtn
3) Try to click disconnect in role assignment
4) Frozen game that cannot be terminated by task manager etc.