Dear Qt, 

we have some issues with our application, which uses Qt version 05.15.10.12.
Hope you can help us, and answer our questions.

In case of rendering with OpenGL, there is a black border on top of our application, and the display is faulty because of it.
screen1.png
This is very similar to an already reported bug, which can be find here: https://bugreports.qt.io/browse/QTBUG-40485
https://doc.qt.io/qt-5/windows-requirements.html
According to this documentation, 
"For Qt Quick 2 to work, a graphics driver that provides OpenGL 2.1 or higher is required."
Our computer is equipped with an Intel HD4600
Driver version: 20.19.15.5171
OpenGL version 4.3
Operating system: Windows 10 Pro (10.0.19041)
On our other computer which specifications is detailed at the end of my message, there is no any sign of this bug, everything looks/works fine.

What causes this error, and how can we fix this?
Also it would be good to know exactly which hardwares/drivers are affected by this issue.

In case of rendering with OpenGLES on our other computer there are some errors with display in case of scrolled away UI elements
video1.avi
Specs of computer:
Intel Iris Xe
Driver version: 30.0.100.9864
OpenGL version 4.6
Operating system: Windows 10 Enterprise 21H2 (19044.3086)
We want to know what causes these errors, which rendering backend should we use in various cases, and if there is a way to recognize those rendering issues during runtime.

I attached a test application, where the issue can be reproduced easily.

Thanks for your help in advance.