Titanium "horizontal" layout bug on iOS

app.js

//tested with 1.8.1
//it seems that problem exists when button's dimension values are defined using percentages

var win = Ti.UI.createWindow({
	backgroundColor: '#333'
});

var view = Ti.UI.createView({
	backgroundColor: '#93f',
	height: '20%',
	layout: 'horizontal'
});


var button1 = Ti.UI.createButton({
	title: 'Button 1',
	height: '80%',
	width: '30%'
});

var button2 = Ti.UI.createButton({
	title: 'Button 2',
	height: '80%',
	width: '30%'
});

view.add(button1);
view.add(button2);

win.add(view);

win.open();