- Bug in :func:`to_datetime` where passing a timezone-naive :class:`DatetimeArray` or :class:`DatetimeIndex` and utc=True would incorrectly return a timezone-naive result (:issue:`27733`)
- Bug in :class:`Index` where a numpy object array with a timezone aware :class:`Timestamp` and
np.nanwould not return a :class:`DatetimeIndex` (:issue:`27011`)
- Bug in :meth:`Series.interpolate` when using a timezone aware :class:`DatetimeIndex` (:issue:`27548`)
- Bug when printing negative floating point complex numbers would raise an
IndexError(:issue:`27484`)
- Improved the warnings for the deprecated methods :meth:`Series.real` and :meth:`Series.imag` (:issue:`27610`)
- Bug in :class:`IntervalIndex` where dir(obj) would raise
ValueError(:issue:`27571`)
- Added a pandas_plotting_backends entrypoint group for registering plot backends. See :ref:`extending.plotting-backends` for more (:issue:`26747`).
- Bug in :meth:`pandas.core.groupby.DataFrameGroupBy.transform` where applying a timezone conversion lambda function would drop timezone information (:issue:`27496`)
- A
KeyErroris now raised if.unstack()is called on a :class:`Series` or :class:`DataFrame` with a flat :class:`Index` passing a name which is not the correct one (:issue:`18303`)
.. contributors:: v0.25.0..HEAD