PySide2 crash when creating QApplication subclass within main()

Question

I have a PySide2 (5.15.2.1) app on macOS 10.14.6 that works fine under Python 3.6 and 3.7 but crashes under Python 3.8. The minimal crashing example (seg fault 11) is:

from PySide2 import QtCore, QtWidgets
from PySide2.QtCore import Qt

class AppSubclass(QtWidgets.QApplication):
    def __init__(self, *args, **kwargs):
        QtWidgets.QApplication.__init__(self, *args, **kwargs)

def main():
    app = AppSubclass()

if __name__=="__main__":
    main()

Strangely, removing the main function results in no crash:

from PySide2 import QtCore, QtWidgets
from PySide2.QtCore import Qt

class AppSubclass(QtWidgets.QApplication):
    def __init__(self, *args, **kwargs):
        QtWidgets.QApplication.__init__(self, *args, **kwargs)

app = AppSubclass()

Is there something not right about how I'm subclassing QApplication?

Answer 1

This turns out to likely be a bug in PySide, which has been solved. See https://bugreports.qt.io/browse/PYSIDE-1447