[REG Qt5.15.2 => Qt 6.2.4] QScreen returns inconsistent screen size

See attached example and look at the output. Qt5 always returned the size in Qt (screen) units.

In Qt6 the 4K screen size (i.e unit of it) is depending on 'some circumstances' with the other screen. It sometimes returns the screen size in either screen pixels and other times in Qt (screen) unit.

It ought be extremely easy to place a widget or other graphics at the center of the screen, but with this Qt6 issue it is suddenly near hopeless. ( See also https://bugreports.qt.io/browse/QTBUG-103184 )

PS: I didn't use QtDiag.exe because high dpi isn't enabled by default in Qt5 and I could not see an easy way to enable it by command line.