QListWidgetItem checkbox issue

import sys

from PySide6.QtWidgets import QStyleFactory

from PySide6.QtWidgets import QApplication, QMainWindow, QListWidget, QListWidgetItem, QVBoxLayout, QWidget
from PySide6.QtCore import Qt


class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("All rows should be checkable, only the first one is.")
        layout=QVBoxLayout()
        checklist=QListWidget()
        # Uncommentting the following line fixes the issue (with a different style)
        #checklist.setStyle(QStyleFactory.create("Fusion"))
        checklist.clear()
        # Add 3 checkable rows.
        for name in ["foo", "bar", "baz"]:
            item=QListWidgetItem(name)
            item.setFlags(Qt.ItemIsUserTristate|Qt.ItemIsUserCheckable|Qt.ItemIsEnabled|item.flags())
            item.setCheckState(Qt.Checked)
            checklist.addItem(item)
        layout.addWidget(checklist)
        central=QWidget()
        central.setLayout(layout)
        self.setCentralWidget(central)


app=QApplication(sys.argv)
win=MainWindow()
win.show()
app.exec()