ionic-framework: zoom in ion-scroll not working in beta 2.0

Short description of the problem:

zoom option in <ion-scroll> is not working in beta 2.0m also the scrollY is poorly working on iOS.

What behavior are you expecting?

I’m expecting the zoom to work when I add zoom="true" and maxZoom="2" to <ion-scroll>

Steps to reproduce:

1. use the code provided below (modification of demo)
2. pinch the screen

this the code from the demo modified

<ion-content>
    <ion-scroll maxZoom="2" zoom="true" scrollX="true" scrollY="true" style="width: 100%; height: 100%">
        <div class="map-div"></div>
    </ion-scroll>
</ion-content>

<style>
    .map-div {
        width: 2600px;
        height: 1400px;
        background: url('./map.jpeg') no-repeat;
    }
</style>

Ionic Version: 2.0

Browser & Operating System: iOS / Chrome

Run ionic info from terminal/cmd prompt:

Cordova CLI: 6.0.0
Ionic Version: 2.0.0-beta.1
Ionic CLI Version: 2.0.0-beta.17
Ionic App Lib Version: 2.0.0-beta.8
ios-deploy version: 1.8.5 
ios-sim version: 5.0.1 
OS: Mac OS X El Capitan
Node Version: v4.3.1
Xcode version: Xcode 7.2.1 Build version 7C1002