The reason we keep two days of yom tov is gone but we say מנהג אבותינו בידינו. The Chasan Sofer interprets that the strength of following a minhag is so great that it can break a bad ruling from above. The word המלכות in דלמא דגזרו המלכות גזירה ואתי לקלקלי can also refer to the heavenly court.
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