Character data is automaticly saved every ~5 minutes OR when a character logs out.
When the server is shut down, the data doesn't save.
So if you give 1 character some items/money, if you know the server will be shut down in 1 minute, that character logs out, the items in his inventory saves, and you stay logged it, server shuts down, your info doesn't save, so you are rollbacked to when you had the items.
Due to this, the GMs don't announce maintenance anymore, so that this bug couldn't be abused.
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