On Qt 6, with DPI rounding policy enabled, fullscreen doesn't cover entire screen

In a Qt 6 app running on Windows with DPI scaling enabled, if the app has a rounding policy set, radio buttons are shrunken (compared to removing the rounding policy) and missing columns/rows of pixels, and the app does not cover the full screen.

• Before creating a window, call QApplication::setHighDpiScaleFactorRoundingPolicy(Qt::HighDpiScaleFactorRoundingPolicy::RoundPreferFloor). Round has the same effect.

Radio buttons appear too small, and are missing columns and rows of pixels.

• After creating and showing a window, map an action like F11 to set the QMainWindow to fullscreen (windowHandle()->setWindowState(Qt::WindowFullScreen)).

The entire window fails to cover the full screen.

Test app at https://codeberg.org/nyanpasu64/scanlines.

Dolphin Emulator 5.0-19368 is on Qt 6.3.0, has a rounding policy enabled (newer versions of Dolphin do not have a rounding policy anymore), and does not have shrunken radio buttons. So perhaps this bug was introduced in a more recent version of Qt?