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 the window:
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