grabWindow() does not capture entire second screen

grabWindow() is unable to capture entire screen in dual screen setup and if second screen happen to be 4k when capturing as follows:

QRect desktopGeo = QApplication::primaryScreen()->virtualGeometry();
  QPixmap screenshotFullscreen = QApplication::primaryScreen()->grabWindow(0, 
       desktopGeo.x(), desktopGeo.y(), desktopGeo.width(), desktopGeo.height());

The resulting image from grabWindow lacks the 25% on the second screen. As it seems that the devicePixelRatio is ignored by grabWindow function.

Setup:
First screen QRect(0,0 1920x1080) / devicePixelRatio: 1
Second screen QRect(1920,-764 3072x1728) / devicePixelRatio: 1.25

Attached small code reproduces this.

This works good with Qt5.15.11 and Qt6.2.4.