[TIMOB-28488] iOS 15: Modal navigation window jumps navigation bar

   const win1 = Titanium.UI.createWindow();
   win1.addEventListener('click', () => {
   	const navWin = Ti.UI.createNavigationWindow({
   		window: Ti.UI.createWindow({
   			title: 'A window'
   		})
   	});
   	navWin.open({ modal: true })
   });
   win1.open();
   
   

    var homeWin = Ti.UI.createWindow();
    
    var openButton = Ti.UI.createButton({
    	title: "Open",
    	backgroundColor: 'blue',
    	color: 'white',
    	font: {
    		fontSize: 24
    	}
    });
    
    openButton.addEventListener('click', function (e) {
    	var modalWin = Ti.UI.createWindow({
    		backgroundColor: 'gray',
    		title: 'modal',
    		barColor: 'blue',
    		height: 300,
    		width: 200,
    		modal: true
    	});
    	var label = Ti.UI.createLabel({
    		Text: "Here",
    		backgroundColor: 'teal',
    		height: 64,
    		top: 0
    	});
    	modalWin.add(label);
    
    	var mainWindow = Ti.UI.createNavigationWindow({
    		height: 300,
    		width: 200,
    		window: modalWin
    	});
    
    	mainWindow.open();
    
    });
    
    homeWin.add(openButton);
    homeWin.open();