Hello, there's a problem with the supply drop (/supply). I'm not sure if that's the correct board, if not move it please.
Imho supply request should be disabled 1 minute before the city change because it will lead to a 'bug'.
EG: I requested a supply drop without noticing there were left 10 seconds on city change, supply started to drop and city changed. I spawned in the new city and tried again to call a supply, result: "You have already called a supply drop".
And it wouldn't let you recall it until you rejoin the server. So my suggestion is to disable the supply drop request when < 1 minute is left for the city change.