[Python] Calling QDialog.reject() has no effect - why? How do I close my dialog when certain...

Calling QDialog.reject() has no effect. What am I missing?

from PySide6.QtWidgets import QApplication, QMainWindow, QPushButton, QDialog, QVBoxLayout
class MyDialog(QDialog):
def __init__(self):
super().__init__()
print('MyDialog created')
self.setWindowTitle('My Dialog')
button = QPushButton('Close')
button.clicked.connect(self.accept)
self.setLayout(QVBoxLayout())
self.layout().addWidget(button)
self.reject()


class MainWindow(QMainWindow):
def __init__(self):
super().__init__()
button = QPushButton("Press Me!")
button.clicked.connect(self.show_dialog)
self.setCentralWidget(button)

def show_dialog(self):
d = MyDialog()
rv = d.exec()
if rv == QDialog.Accepted:
print('Dialog accepted')
else:
print('Dialog rejected')


app = QApplication([])
window = MainWindow()
window.show()
app.exec()


When running the program, the dialog shows up and I can press "Close". The return value is 'Accepted'. I would expect the dialog would either not show or close right away, and that the return value should be 'Rejected'

What am I missing?

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