Theme parsing error for Qt applications

Ask Fedora
1

Hi,
I installed the Fedora 39 XFCE spin today. When I launch some Qt applications, like keepassxc, the following error appears on the command line and the application style and especially the font scaling is completely messed up:

$ keepassxc

(keepassxc:594816): Gtk-WARNING **: 22:56:35.713: Theme parsing error: <data>:1:0: Expected a valid selector

Does anyone have an idea why this might happen? I did not change any gtk.css files, and it happens both with the Greybird and the default XFCE theme. It also only happens for some Qt applications like keepassxc, but not e.g. for the Qt application okular.

2

I tried installing qgnomeplatform-qt5 and qgnomeplatform-qt6, but that didn’t change anything.