[Reg 6.8.0 -> 6.8.2] Strange 4-quadrant colouration of Qt Quick items

I was unable to reproduce this issue on my own devices, but here is a simple project that reproduces it for the customer on a Samsung Galaxy A12. I've seen a similar phenomenon reported on a Yocto device (also when upgrading to Qt 6.8.2)

Steps to reproduce

1. Build and run the test project from Qt Creator in Debug mode
2. Tap the two buttons
3. Fully shut down the app
4. Launch the app again without redeploying
5. Tap the two buttons

Outcomes

(Step #2) Everything looks normal (Expected)

(Step #5) The tapped button gains a strange background (Not Expected)

Notes

• The glitch reminds me of this shader output which assigns a colour based the pixel's Cartesian quadrant: https://stackoverflow.com/questions/75977335/why-do-fragment-shader-colors-an-image-based-on-the-fragment-coordinate-as-a-sat
• Here is a bug report of the glitch happening in a real app: https://github.com/mavlink/qgroundcontrol/issues/12449 (see the various screenshots in the report – one has this strange colouration, while another has diagonal streaks across the screen. Both glitches look different, but both could indicate a GPU-related issue)