Prevent enabling lock screen camera not work

Hi,

I'm using win11,

In the group policy, there is a setting Prevent enabling lock screen camera. 

From the wording, it will block the camera when I lock the screen.

but when I enabled this setting and locked screen,  I can still call the camera by using script. 

eg. 

import cv2

cap = cv2.VideoCapture(0)

Could you help to advice how this "Prevent enabling lock screen camera" setting work, and how can I check it's really effect after enabled. 

thanks.