These are the changes in pandas 1.2.0. See :ref:`release` for a full changelog including other versions of pandas.
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- Bug in :func:`date_range` was raising AmbiguousTimeError for valid input with ambiguous=False (:issue:`35297`)
- Bug in :meth:`DataFrameGroupBy.apply` where a non-nuisance grouping column would be dropped from the output columns if another groupby method was called before
.apply()(:issue:`34656`)