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pandas 1.5.0 introduced a regression in the groupby behavior—which we fixed with #2007—but just restored the previous behavior in 1.5.1 (see https://pandas.pydata.org/docs/whatsnew/v1.5.1.html#behavior-of-groupby-with-categorical-groupers-gh48645)
We too restore the previous code and avoid installing 1.5.0.