[Python] Redraw a QPushButton after .setDown is called?

Consider the following example:

import sys
import time
from PyQt5.QtWidgets import QApplication, QWidget, QPushButton, QMessageBox, QVBoxLayout
from PyQt5.QtCore import QTimer

app = QApplication(sys.argv)
window = QWidget()
window.setWindowTitle("Minimal PyQt5 Example")

button = QPushButton("Click Me")
button.setCheckable(True)

def unpress_button():
button.setDown(False)
print("{}: unpress_button: {}".format(time.time(), button.isDown()))

def show_message_box():
msg_box = QMessageBox()
msg_box.setText("Button clicked")
msg_box.setStandardButtons(QMessageBox.Ok)
ok_button = msg_box.button(QMessageBox.Ok)
ok_button.setText("OK")
msg_box.exec_()
unpress_button()
QTimer.singleShot(1000, unpress_button)

button.clicked.connect(show_message_box)

layout = QVBoxLayout()
layout.addWidget(button)
window.setLayout(layout)

window.show()
sys.exit(app.exec_())


At start of the application, we get the button in its unchecked/unpressed state:



When the button is clicked, since it is .setCheckable, it is rendered in its checked/pressed state, as expected - and a "Button clicked" sub dialog appears:



What I want now, is that after the OK button is pressed on the sub dialog and the sub dialog disappears, the original button should be automatically restored to its unpressed/unchecked state. I was hoping to do that via the unpress_button function, which runs button.setDown(False) - and in fact the printouts show that the "down" property is indeed set to False:

1750425124.4820263: unpress_button: False
1750425125.5181835: unpress_button: False


... however, after all this, the button remains drawn/rendered in its "pressed"/"checked" state:



Note that I have even used QTimer.singleShot so I could escape the context of the show_message_box handler, but that does not help either.

So, how can I force the button to be drawn in its "unpressed"/"unchecked" state, as it should be as per what its .isDown() method indicates?

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