[Python] Pyglet overlay/transparent style not transparent

When I run the program, the window (top right and bottom left) is supposed to be transparent but instead, it is black

Here is an image of a lilac window, with a grey line around the bottom and right edge, black, opaque squares on the bottom left and top right:

There are no warning or errors in the console

Here is the code I used:

import pyglet
from pyglet.window import *

win = Window(width=650, height=370, style=Window.WINDOW_STYLE_OVERLAY, resizable=False)
screen = win.display.get_default_screen()
win.set_location((screen.width//2 - win.width//2) + 5, (screen.height//2 - win.height//2) + 5)

@win.event
def on_draw():
win.clear()
shadow = pyglet.shapes.Rectangle(x=10, y=0, width=win.width - 10, height=win.height - 10, color=(100, 100, 100, 100))
shadow.draw()
background = pyglet.shapes.Rectangle(x=0, y=10, width=win.width - 10, height=win.height - 10, color=(150, 100, 255))
background.draw()

pyglet.app.run()


Extra context:

Python 3.12, latest pyglet version, Windows 11, and on PyCharm

I tried using python 3.8, the Window.WINDOW_STYLE_TRANSPARENT style, updating my drivers, changing the objects, and more, but nothing worked

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