Buggy rendering on RHEL 8 with 200% system scaling

I've got it with Qt 6.6.2 on Rocky Linux 8.9 to be precise. It looks like the application is rendered at 100% scaling while the system has 200% scaling, the window accepts input coordinates scaled twice relative to the actual window size (i.e. it's rendered as 100% but input events are still 200%), the content updates partially (at least with widgets, not sure about qml) and this should be reproducible with any Qt example. If I set QT_WAYLAND_DISABLED_INTERFACES=wp_viewporter, the bug disappears. My guess the bug is caused by the lack of setting buffer scale when viewporter is active.