python complains about BaseException being unsafe

[yogo1212]

  File "../lib/python3.8/site-packages/chameleon/exc.py", line 321, in __call__
    exc = create_formatted_exception(exc, type(exc), exc._original__str__)
  File "../lib/python3.8/site-packages/chameleon/utils.py", line 227, in create_formatted_exception
    inst = cls.__new__(new)
TypeError: BaseException.__new__(SyntaxError) is not safe, use SyntaxError.__new__()

        try:
            inst = BaseException.__new__(new)
        except TypeError:
            inst = cls.__new__(new)     # line 227

        BaseException.__init__(inst, *exc.args)
        inst.__dict__ = exc.__dict__

[malthe]

Can't reproduce this on Python 3.9.