Android 13 has an App browser with search function. When the browser starts, the search field is in focus and the keyboard open. It disappears once you scroll down. It's still possible to open apps before the keyboard disappears, and in this case, Qt Quick apps use only half of the screen (roughly). The correct screen size is restored when rotating the screen to landscape and back.

When testing, make sure to close the app. It works correctly if the app is only suspended.

I've tested it on the versions mentioned above and on 6.6 snapshot available in the maintenance tool.

It does work on Qt 5.15.2, and Qt 6.3.2

It also works on my old Nokia 8 (Android 9).

Related issues are (but I don't think they are the same, hence posting a new one):

QTBUG-107604
QTBUG-107923
QTBUG-109268