QWidget::restoreGeometry doesn't restore correct screen number if application was in maximized or fullScreen state

QSettings settings;
restoreGeometry(settings.value("mainWindowGeometry").toByteArray());
// Application is on primary screen

if ( isFullScreen() ) {
    showNormal();
    showFullScreen();
    // Application is on another screen, where is was before calling QWidget::saveGeometry
};

/*	I want to move a window from screen 0 to screen 1 in fullscreen state,
	screen 0 has different resolution than screen 1.
*/
void CMyWindow::moveToScreen(int screen) {
	// window is on screen 0 in fullscreen state
	// screen == 1

	QDesktopWidget desktop;
	if (desktop.screenCount() <= screen) return;
	// screenCount returns 2

	QRect screenGeometry = desktop.availableGeometry(screen);
	bool fullScreen = this->isFullScreen();
	bool maximized = this->isMaximized();
	// screenGeometry is corrent
	// fullScreen == true

	if (fullScreen || maximized) this->showNormal();
	// window is on screen 0 in normal state

	QRect geometry = this->geometry();
	geometry.moveCenter(screenGeometry.center());
	this->setGeometry(geometry);
	// window is on screen 1 in normal state

	if (fullScreen) this->showFullScreen();
	if (maximized) this->showMaximized();
	// Window is on screen 0 in fullscreen state.
	// BUG, it must be on screen 1, but it is on screen 0 somehow.

	// bug walkaround
	if (fullScreen) {
		this->showNormal();
		this->showFullScreen();
	};
	// window is on screen 1 in fullscreen state
};