I'm not sure to understand why, but fonts are blurry with my program only with Qt 5.15 (not with Qt 6.10/6.11), and only with Fedora (no problems with Debian Testing). See screenshots.

Reproducible: Always

Steps to Reproduce:
1. With MATE (GTK3 + QT5/QT6 with GTK3 platform theme)
2. Add in /etc/environment: FREETYPE_PROPERTIES="truetype:interpreter-version=35"
3. Restart your session
4. Install awf-qt5 & awf-qt6
5. Run awf-qt5 & awf-qt6

Actual Results:
Fonts are blurry with qt5 (see schreenshots).

Expected Results:
Same font rendering between qt5 and qt6.

Additional Information:
You can install human-theme-gtk and qt5-globalqss/qt6-globalqss.
But without there is the same problem.