QDialog flashes light mode before redrawing in dark mode

from PySide6.QtCore import Qt
from PySide6.QtGui import QIcon
from PySide6.QtWidgets import QApplication, QDialog, QDialogButtonBox, QLabel, QMenu, QPushButton, QSystemTrayIcon, QVBoxLayout, QStyle, QWidget
import sys

class DarkQDialogMayFlashLightFirst(QSystemTrayIcon):
    def __init__(self, _icon):
        super().__init__(_icon)
        self.tray_icon = QSystemTrayIcon
        self.tray_menu = QMenu()
        self.tray_menu.addAction('Exit', QApplication.exit)
        self.tray_menu.addAction('QDialog', self.dialog)
        self.setContextMenu(self.tray_menu)

    @staticmethod
    def dialog():
        text = '\n' * 30
        labelText = QLabel(text)
        buttonOk = QPushButton('Ok')
        buttonOk.clicked.connect(lambda: dialog.close())
        buttons = QDialogButtonBox()
        buttons.addButton(buttonOk, QDialogButtonBox.AcceptRole)
        layout = QVBoxLayout()
        layout.addWidget(labelText)
        layout.addWidget(buttons)
        dialog = QDialog()
        dialog.setLayout(layout)
        dialog.exec()

sys.argv += ['-platform', 'windows:darkmode=2']

def main():
    app = QApplication(sys.argv)
    app.setQuitOnLastWindowClosed(False)
    app.setStyle('Fusion')

    app_icon = QApplication.style().standardIcon(QStyle.StandardPixmap.SP_MessageBoxQuestion)

    tray_icon = DarkQDialogMayFlashLightFirst(app_icon)
    tray_icon.show()

    sys.exit(app.exec())

if __name__ == '__main__':
    main()