Issue v1.2.1 : ion-content scrolling not working with ion-slides directive

With the new Ionic version available, I tried to migrate my current app to have the benefits of the new directive.
But I am currently struggling with a strange behavior after the migration. Scroll feature in slides (ion-slide-page) does not work anymore.
Indeed, for every slide, content is dynamically built using ng-repeat. But, when ng-repeat directive has finished to populate the DOM, scrolling area is not updated and user cannot scroll to bottom of the page.

I tried to build a codepen in order to enlight the issue:

Anyone has an idea of the issue?