`print(project)` fails for specific cases

For some reason the Project.data of my TestProject reads

 'displayName': 'TestProject',
 'startDate': '2020-09-24T06:46:58.497',
 'endDate': '2020-10-31T07:46:00',

which results in the following error if a print is attempted:

---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
Cell In [17], line 1
----> 1 pr.startDate

File /mnt/c/Users/Siemer/pyiron_git/other_git_repos/coscine-api-python-client/src/coscine/project.py:187, in Project.startDate(self)
    185 @property
    186 def startDate(self) -> datetime:
--> 187 	return datetime.strptime(self.data["startDate"], TIMEFORMAT)

File ~/anaconda3/envs/pyiron/lib/python3.8/_strptime.py:568, in _strptime_datetime(cls, data_string, format)
    565 def _strptime_datetime(cls, data_string, format="%a %b %d %H:%M:%S %Y"):
    566     """Return a class cls instance based on the input string and the
    567     format string."""
--> 568     tt, fraction, gmtoff_fraction = _strptime(data_string, format)
    569     tzname, gmtoff = tt[-2:]
    570     args = tt[:6] + (fraction,)

File ~/anaconda3/envs/pyiron/lib/python3.8/_strptime.py:352, in _strptime(data_string, format)
    349     raise ValueError("time data %r does not match format %r" %
    350                      (data_string, format))
    351 if len(data_string) != found.end():
--> 352     raise ValueError("unconverted data remains: %s" %
    353                       data_string[found.end():])
    355 iso_year = year = None
    356 month = day = 1

ValueError: unconverted data remains: .497