Changing the icon on the taskbar does not work?

Question

Python

I wanted to make the icon displayed not only in the corner of the window, but also on the taskbar.
Found this solution:

import ctypes
import pygame as pg
ctypes.windll.shell32.SetCurrentProcessExplicitAppUserModelID(u"my.app.id.01")

window=pg.display.set_mode((1200,400))
pg.display.set_caption('Test')
icon = pg.image.load('icon.png')
pg.display.set_icon(icon)
screen=pg.Surface((1200,400))

#code, code, code...

But it works once. Sometimes everything is fine, sometimes the pythonw icon pops up, sometimes the standard pygame.