QApplication.setOverrideCursor has no effect

#!/usr/bin/env python
import sys 
from PySide6.QtGui import *
from PySide6.QtCore import *
from PySide6.QtWidgets import * 

app = QApplication ( sys.argv ) 
cursor = QCursor(Qt.WaitCursor)
shape = Qt.WaitCursor 
print(cursor) 
print(shape) 
# QApplication.setOverrideCursor( cursor )
QApplication.setOverrideCursor( shape ) 
window = QLabel("WAIT") 
window.resize(300, 400) 
window.show() 
sys.exit ( app.exec() )