Qt 6 (PyQt6) porting issues

[ghost]

Hi, i have this code:

# Click on mpv window toggles overlay visibility
import sys
import os
import signal
import locale
import mpv
# Everything is working good if PyQt5 set here
# but broken if PyQt6 (show only first time and ignoring click events then)
from PyQt6 import QtWidgets, QtCore

class Test(QtWidgets.QMainWindow):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.container = QtWidgets.QWidget(self)
        self.setCentralWidget(self.container)
        self.container.setAttribute(QtCore.Qt.WidgetAttribute.WA_DontCreateNativeAncestors)
        self.container.setAttribute(QtCore.Qt.WidgetAttribute.WA_NativeWindow)

        player = mpv.MPV(wid=str(int(self.container.winId())),
                vo='x11')

        @player.on_key_press('MBTN_LEFT')
        def left_btn_handler():
            if overlay.isVisible(): # <=====
                overlay.hide()
            else:
                overlay.show()

        player.mute = True
        player.play('https://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4')

app = QtWidgets.QApplication(sys.argv)
app.aboutToQuit.connect(lambda: os.kill(os.getpid(), signal.SIGTERM))
locale.setlocale(locale.LC_NUMERIC, 'C')

win = Test()
win.resize(960, 540)

overlay = QtWidgets.QLabel("Hello World!", win) # <=====
overlay.resize(100, 50)
overlay.setAlignment(QtCore.Qt.AlignmentFlag.AlignCenter)
overlay.setStyleSheet('color: red')
overlay.hide()

win.show()
try:
    sys.exit(app.exec_())
except:
    sys.exit(app.exec())

it's working good in PyQt5 but broken in PyQt6 (try clicking multiple times on mpv window).
Is this python-mpv issue?