QT6 Applications not themed in dark mode

[pheiduck]

the Theme of Easy Effects is not in dark mode, as the system is configured to use it.
Also happend to other qt6 applications.:

[Teo]

Hi, i am also on xfce and most of the qt apps, 5 and 6, are correctly themed. Testing with ark, qbittorrent, audacious and kde connect. For some reason kde connect is white, but everything else follows the dark theme.

I have qt6 config tool installed and there kvantum-dark selected. (kvantum is also installed obviously, and the theme is compatible - matcha dark). Qt5 config tool is also installed and configured the same way
I also have the QT_QPA_PLATFORMTHEME="qt5ct" variable exported. Not sure if it changes anything (you can also try qt6ct nowadays, should also work)

[Aragorn]

@pheiduck

the Theme of Easy Effects is not in dark mode, as the system is configured to use it.
Also happend to other qt6 applications.:

Some of the newer qt6 applications have their own settings for colors and styling, and easyeffects is one of those.