This is a known qt5-base issue [1], especially on gnome-wayland. The
qgnomeplatform theme, which provides uniform look for QT and GTK apps, doesn't 
support GTK3 wayland compositor.

As temporary workaround, you can tell GTK3 library to use x11 backend
(GDK_BACKEND=x11) or by installing qt5ct package and setting
QT_QPA_PLATFORMTHEME variable to qt5ct.


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