How to bind a css class to a ion-nav-bar in Ionic 1.0.14

I've been trying to upgrade my Ionic app from Ionic 1.0.12 to 1.0.14.

Currently, I'm struggling with the new cache mechanism of the rendered views :

In 1.0.12 I could easily bind the class attribute of my ion-nav-bar with :

<ion-nav-bar class="status-{{user.status}}">

but since 1.0.14, it seems that the cache system clone the class attribute of my ion-nav-bar to a new child element ion-header-bar (which didn't exist in 1.0.12) which is not binded to user.status

How to replicate the old behaviour with this new version of Ionic ?