I have no detailed code. The way to I produce it is that using PyType_FromSpec() to generate a type A without the flag Py_TPFLAGS_DEFAULT(which sets the flag Py_TPFLAGS_HAVE_VERSION_TAG).

Then compile and run in Python.

from my_pkg import A
class Time1(Time):
    def __init__(self):
        pass

import multiprocessing (This import is a method to 100% reproduce it. Another way is to use python3-dbg running the code.)