Ionic-framework: Bad z-index between Alerts and menu

Short description of the problem:

When an alert is triggered, and the side menu is open, the alert shows behind the side menu.

What behavior are you expecting?

When i trigger the alert with the menu open, the alert will show in front of all (superior z-index)

Steps to reproduce:

1. Create a side menu when a ion-item
2. Bind click of the ion-item with an alert
3. Open side menu and click the ion-item

Please see the plunker and just click in the navbar, will open the side menu,
then click in the item of the side-menu and see how the alert shows behind the menu

Other information: (e.g. stacktraces, related issues, suggestions how to fix, stackoverflow links, forum links, etc)
I think the problem is with the display flex breaking the z-index

Which Ionic Version? 1.x or 2.x
2.0 beta9

Plunker

You can test this here
http://plnkr.co/edit/wgyEsyic58cLs4dbyvRX?p=preview