Ionic Tabs hide on keyboard not working

In my Ionic project, I'm using the following tabs:

<ion-tabs  class="tabs-icon-top tabs-background-dark tabs-color-light hide-on-keyboard-open">


<!-- MAP Tab -->
<ion-tab ng-hide = "true" title="Map" icon="icon ion-map" href="#/tab/map">
    <ion-nav-view name="tab-map"></ion-nav-view>
</ion-tab>

<!-- CHAT Tab -->
<ion-tab title="Chat" icon="icon ion-chatbubble" href="#/tab/chat">
    <ion-nav-view name="tab-chat"></ion-nav-view>
</ion-tab></ion-tabs>

However, when opening the keyboard, on both iOS and Android, the tabs remain, even if I have the keyboard plugin installed.

When I try to hide any other object using "hide-on-keyboard-open", it works smoothly.

What could be wrong here?