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BUG: series.groupby(level=0) and series.groupby(pd.Grouper(level=0)) produce different orders #29634

BUG: series.groupby(level=0) and series.groupby(pd.Grouper(level=0)) produce different orders

BUG: series.groupby(level=0) and series.groupby(pd.Grouper(level=0)) produce different orders #29634