> I can't even reproduce it :-( Maybe my current font configuration helps:
pixel order: rgb hinting: true hintstyle: full antialias:false ( I tried to put here my ~/.config/fontconfig/fonts.conf but it does not get through the list ) KDE settings is use system settings. I suspect it is trying to draw that particular labels with another kind of hinting or even aliased but I don't know how to debug it.
