NP_NAT error when attempting to import pandas_market_calender - python-3.9

I'm trying things out on windows vs linux where I have this working in 3.8 and 3.9.5, but not on windows using anaconda
import sys
sys.path.append("../")
from datetime import time
import pandas as pd
import pandas_market_calendars as mcal
error
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "C:\Users\User\Anaconda3\envs\py39\lib\site-packages\pandas_market_calendars\__init__.py", line 19, in <module>
from .calendar_registry import get_calendar, get_calendar_names
File "C:\Users\User\Anaconda3\envs\py39\lib\site-packages\pandas_market_calendars\calendar_registry.py", line 21, in <module>
from .exchange_calendars_mirror import *
File "C:\Users\User\Anaconda3\envs\py39\lib\site-packages\pandas_market_calendars\exchange_calendars_mirror.py", line 9, in <module>
import exchange_calendars
File "C:\Users\User\Anaconda3\envs\py39\lib\site-packages\exchange_calendars\__init__.py", line 16, in <module>
from .calendar_utils import (
File "C:\Users\User\Anaconda3\envs\py39\lib\site-packages\exchange_calendars\calendar_utils.py", line 3, in <module>
from .always_open import AlwaysOpenCalendar
File "C:\Users\User\Anaconda3\envs\py39\lib\site-packages\exchange_calendars\always_open.py", line 5, in <module>
from .exchange_calendar import ExchangeCalendar
File "C:\Users\User\Anaconda3\envs\py39\lib\site-packages\exchange_calendars\exchange_calendar.py", line 27, in <module>
from .calendar_helpers import (
File "C:\Users\User\Anaconda3\envs\py39\lib\site-packages\exchange_calendars\calendar_helpers.py", line 6, in <module>
NP_NAT = np.array([pd.NaT], dtype=np.int64)[0]
TypeError: int() argument must be a string, a bytes-like object or a number, not 'NaTType
'

Posted a github bug
indeed something changed and the culprit is pandas
https://github.com/rsheftel/pandas_market_calendars/issues/137
to solve, install pandas==1.2.5 and it will work

The error is with the underlying exchange_calendars package (https://github.com/gerrymanoim/exchange_calendars). It appears that error has been fixed in that package. If you update the exchange_calendars package everything will work fine. Nothing to do in this package.
Fix: gerrymanoim/exchange_calendars#41

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Traceback (most recent call last):
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File "C:\Users\biplavc\Documents\AoI_work\envs\dist_AoI_ver5\tf_environment.py", line 38, in <module>
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File "/usr/local/bin/clickhouse-mysql", line 7, in <module>
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