The Meaning of Life, the Universe, and Everything.
The bug that they fixed was a very major exploit of the game that allowed for very easy item duplication. That's something you want fixed as soon as possible to avoid breaking server economies, but you also don't want to be too open about it for those servers still running a version of the game in which the exploit is active.
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I'm no longer allowed on this forum. Because I don't have a Twitch account.