Cannot localize tz-aware Timestamp, use tz_convert for conversions

[kmax12]

Following error reported running locally on a mac, but not showing up

        date_str = "20220722"
        for m in markets:
            print(iso.iso_id, m)
            latest = iso.get_latest_lmp(m, nodes=nodes)
>           assert isinstance(latest, pd.DataFrame)

isodata/tests/test_isos.py:251:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
isodata/miso.py:102: in get_latest_lmp
    time = pd.to_datetime(time_str).tz_localize(self.default_timezone)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

>   ???
E   TypeError: Cannot localize tz-aware Timestamp, use tz_convert for conversions

pandas/_libs/tslibs/timestamps.pyx:1849: TypeError