Python crash when help(QtCore)

Python 3.8.2 (tags/v3.8.2:7b3ab59, Feb 25 2020, 23:03:10) [MSC v.1916 64 bit (AMD64)] on win32
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>>> from PySide2 import QtCore
>>> help(QtCore)
Traceback (most recent call last):
  File "C:\Users\OEM\AppData\Local\Programs\Python\Python38\Lib\site-packages\shiboken2\files.dir\shibokensupport\signature\loader.py", line 105, in make_helptext
    return errorhandler.make_helptext(func)
  File "C:\Users\OEM\AppData\Local\Programs\Python\Python38\Lib\site-packages\shiboken2\files.dir\shibokensupport\signature\errorhandler.py", line 138, in make_helptext
    msg = sigtext + "\n\n" + existing_doc if existing_doc else sigtext
TypeError: can only concatenate str (not "getset_descriptor") to str
Fatal Python error: handle_doc did not receive a result
Python runtime state: initializedCurrent thread 0x000021e0 (most recent call first):
  File "C:\Users\OEM\AppData\Local\Programs\Python\Python38\lib\inspect.py", line 613 in getdoc
  File "C:\Users\OEM\AppData\Local\Programs\Python\Python38\lib\pydoc.py", line 95 in getdoc
  File "C:\Users\OEM\AppData\Local\Programs\Python\Python38\lib\pydoc.py", line 1240 in docclass
  File "C:\Users\OEM\AppData\Local\Programs\Python\Python38\lib\pydoc.py", line 381 in document
  File "C:\Users\OEM\AppData\Local\Programs\Python\Python38\lib\pydoc.py", line 1178 in docmodule
  File "C:\Users\OEM\AppData\Local\Programs\Python\Python38\lib\pydoc.py", line 380 in document
  File "C:\Users\OEM\AppData\Local\Programs\Python\Python38\lib\pydoc.py", line 1680 in render_doc
  File "C:\Users\OEM\AppData\Local\Programs\Python\Python38\lib\pydoc.py", line 1687 in doc
  File "C:\Users\OEM\AppData\Local\Programs\Python\Python38\lib\pydoc.py", line 1967 in help
  File "C:\Users\OEM\AppData\Local\Programs\Python\Python38\lib\pydoc.py", line 1908 in __call__
  File "C:\Users\OEM\AppData\Local\Programs\Python\Python38\lib\_sitebuiltins.py", line 103 in __call__
  File "<stdin>", line 1 in <module>