Qt 5.9.0 beta 2 Android showFullScreen() does not hide Android status bar anymore on some devices.

showFullScreen() in Qt Android hides the status bar. Working fine up to Qt 5.9 beta 2. Now on some devices at application start the status bar disappears for a moment but then reappears as white rectangle.

Code to set fullscreen:

QtQuick2ApplicationViewer viewer;
...
viewer.showFullScreen();

Some devices affected are Minix U1 with Android 5 and Samsung Tab 2 (GT-P5100, Android 6.0.1). On others such as Samsung Tab S2 (also 6.0.1) or Minix X7 there is no problem.

Adding android:theme="@android:style/Theme.NoTitleBar.Fullscreen" to the Android manifest changes the rectangle color from white to black on the Minix U1.