Title does not show on QMessageBox on mac

The title does not show up when running QMessageBox.

1. create python virtual environment
2. pip install PySide6
3. Put this in a file "simple.py":

from PySide6.QtWidgets import QApplication, QMessageBox

def info():
msg = QMessageBox()
msg.setWindowTitle("Info")
msg.setText("Some info")
msg.exec()

if _name_ == "_main_":
app = QApplication([])
info()

4. Run "python simple.py" 

The title "Info" does not show. Attached is a screenshot of what I see.

This is a simple example, but I am experiencing this same issue when I use QMessageBox.information() and QMessageBox.question().

macbook air apple M1 chip