No it isn't a bug. Yes there is evidence. Once again, just because you couldn't find it, doesn't mean there isn't. It's not even hard to find.
http://www.tski.co.jp/baldio/patch/20001115.html
Quote:
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Song of Twilight: Increased duration. Made less resistible by removing the secondary resist. Allowed it to be cast at any time of day.
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