8M autofocus sensor module failed demos

I think something is wrong with these Demo scripts, because they run more or less well, but closing them DOES NOT keep the focus, making it useless to take photos or video. I have tested the official 8M V2 camera module on a raspberry Pi 3A +, with updated stretch and buster:

1- Snapshot.py

-When running it, the small window pygame appears in BLACK.
-Press UP key: value always 512 Image save OK.
-We set the focus completely to BLIND.
-We see all the jpg defocused.
-We close the main cmd window.

Result: 18 unfocused photos.jpg

2- Preview.py

-When executing it, two windows appear: the small and always BLACK pygame, and the enormously large Preview, which hides much of the desktop.
-Close correct focus with the UP key up to a value of 272, and we stop.
-We close the window.
-We take a photo with raspistill -or previous.jpg of the previously focused object, totally out of focus.

Result: the camera DOES NOT SAVE THE FOCUS, making it completely USELESS

3- Autofocus.py

Similar to the previous ones, huge preview window that covers almost everything.
AUTOFOCUS OK, photo OK.
We close the window.
We take a test photo raspistill -o autofocus.jpg: Defocused

Result: Autofocus OK Photo OK, but when closing the window, it doesn't keep focus with raspistill.

4- Folder C, manualFocus.py

-Huge pre-screen, which covers almost the entire desktop.
-Press the UP key, in the command viewer only UP or DOWN appears, (No numerical value)
-We got focus OK.
-We close the window.
-Test photo raspìstill -o manualfocus.jpg DEFOCUSED again.

Result: It does NOT save the focus value. END of the test.

I wonder if it is an error in the demo scripts and if not, what is the use of buying this module? Hope someone from the arducam team can help me clarify this issue. Thanks in advance.

ArduCAM / RaspberryPi