Attached screenshots are from Lenovo Tab P11 running Android 11. Something is now scaling the UI smaller than it should be. At least scale factor has become different which would explain it:

Qt5.15.11:
Screen.name: Built-in Screen
Screen.width: 941
Screen.height: 1569
Screen.devicePixelRatio: 1.2750000953674316
Screen.pixelDensity: 6.628507662550216

Qt5.15.6:
Screen.name: Returns empty string
Screen.width: 800
Screen.height: 1285
Screen.devicePixelRatio: 1.5
Screen.pixelDensity: 5.627599272973722