That unfortunately is a Qt bug, not specifically a Wayland bug. An issue should be filed there if it is not already. But, it is not likely you will be able to c

That unfortunately is a Qt bug, not specifically a Wayland bug. An issue should be filed there if it is not already. But, it is not likely you will be able to correct it for every app, because Qt apps can technically do whatever they want with their own theme and override the system theme. GNOME's regards towards theming is precisely because of things like Qt themes being broken all the time.