[5.15 => 6.8] Font rendered in different size

Same application renders fonts in different size when compiled with 5.15 and 6.8. Hardware used for running the app with either of the versions is exactly the same.

Problem occurs at least with the following fonts:

• Calibri
• Ubuntu sans

Problem is reproduced in the following environment: Yocto 5.0(Scarthgap) / meta-qt6 layer for Qt

Some observations:

• Setting uniform high dpi rounding policy OR QT_SCALE_FACTOR has no effect, the problem persists
• Cannot be reproduced on Windows
• qtdiag and qt logging give a bit different kind of values between the two versions