[Python] Tkinter Window is empty on MacOS

The script is intended to create a window with a navy background and 200 yellow stars, but the window remains empty, and even the background color does not change. But on my friends laptop (he has Windows 11) this code works

import tkinter
import random

n = 200
width = 800
height = 600

root = tkinter.Tk()
root.title("Hviezdne nebo")

canvas = tkinter.Canvas(root, width=width, height=height, bg='navy')
canvas.pack()

for _ in range(n):
x = random.randint(0, width)
y = random.randint(0, height)
font_size = random.randint(10, 20)
canvas.create_text(x, y, text='*', fill='yellow', font=('Helvetica', font_size))

root.mainloop()


I've tried to reinstall both Python and tkinter - didnt help. Tried this on Windows 11 - it did help

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