event passed to custom "showEvent" is a "QtCore.QEvent" instead of the expected "QtGui.QShowEvent"

import sys

from PySide6 import QtWidgets


class TestWidget(QtWidgets.QWidget):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.showMaximized()

    def event(self, event):
        # custom event processing with fall-back
        return super().event(event)

    def showEvent(self, event):
        # custom showEvent processing with fall-back
        super().showEvent(event)


if __name__ == "__main__":
    app = QtWidgets.QApplication([])
    widget = TestWidget()
    widget.show()
    sys.exit(app.exec()) 

Traceback (most recent call last):
  File "/Users/jbnoel/devel/avdiff/avdiff/test.py", line 23, in <module>
    widget = TestWidget()
  File "/Users/jbnoel/devel/avdiff/avdiff/test.py", line 10, in __init__
    self.showMaximized()
  File "/Users/jbnoel/devel/avdiff/avdiff/test.py", line 14, in event
    return super().event(event)
  File "/Users/jbnoel/devel/avdiff/avdiff/test.py", line 18, in showEvent
    super().showEvent(event)
TypeError: 'PySide6.QtWidgets.QWidget.showEvent' called with wrong argument types:
  PySide6.QtWidgets.QWidget.showEvent(QEvent)
Supported signatures:
  PySide6.QtWidgets.QWidget.showEvent(PySide6.QtGui.QShowEvent)