CLONE - QFileDialog::getOpenFileName don't pop up correctly when QTimer is started with timeout = 0

from PySide6 import QtGui, QtCore, QtWidgets

if __name__ == "__main__":
    app = QtWidgets.QApplication()
    timer = QtCore.QTimer()
    # either use timer.setInterval(100) to fix the issue ...
    timer.setInterval(0)
    def waitForFrame():
        pass
    timer.timeout.connect(waitForFrame)
    timer.start()    pb = QtWidgets.QPushButton()
    pb.setText("Hello")
    def doit():
        with QtCore.QSignalBlocker(timer):
            # .. or uncomment the lines below to get a correct file dialog
            #timer.stop()
            QtWidgets.QFileDialog.getOpenFileName(caption="Select .h5 file", filter="*.h5")
            #timer.start()
    pb.clicked.connect(doit)
    pb.show()
    app.exec()