Windows path creation fails due to attempts at setting a cached property

[techalchemy]

2019-01-22T02:46:33.8697229Z ValueError: Not a valid python path: WindowsPath('C:/Python27amd64/python.exe')
2019-01-22T02:46:33.8697368Z Exception ignored in: <function PathEntry.__del__ at 0x00000277772E4730>
2019-01-22T02:46:33.8697479Z Traceback (most recent call last):
2019-01-22T02:46:33.8697580Z   File "D:\a\1\s\pipenv\vendor\pythonfinder\models\path.py", line 557, in __del__
2019-01-22T02:46:33.8697704Z     BasePath.__del__(self)
2019-01-22T02:46:33.8698625Z   File "D:\a\1\s\pipenv\vendor\pythonfinder\models\mixins.py", line 88, in __del__
2019-01-22T02:46:33.8698774Z     for key in self._pythons.keys():
2019-01-22T02:46:33.8698868Z RuntimeError: dictionary changed size during iteration
2019-01-22T02:46:33.8699006Z Exception ignored in: <function PathEntry.__del__ at 0x00000277772E4730>
2019-01-22T02:46:33.8699123Z Traceback (most recent call last):
2019-01-22T02:46:33.8699225Z   File "D:\a\1\s\pipenv\vendor\pythonfinder\models\path.py", line 557, in __del__
2019-01-22T02:46:33.8699350Z     BasePath.__del__(self)
2019-01-22T02:46:33.8699476Z   File "D:\a\1\s\pipenv\vendor\pythonfinder\models\mixins.py", line 88, in __del__
2019-01-22T02:46:33.8699576Z     for key in self._pythons.keys():
2019-01-22T02:46:33.8699695Z RuntimeError: dictionary changed size during iteration