Ember ArrayProxy with init not working

I have an class that extends Ember.ArrayProxy like:

export default Ember.ArrayProxy.extend({
    init() {
      this._super(...arguments);
      this.set('content', Ember.A([]));
      // doing some stuff
    },
});

and I am using this like:

const myProxy = ProxyClass.create({});
myProxy.addObject(0.5);

but because of init hook override, the changes aren't propagated, so my template is not changing

I think I am doing something wrong, but funny thing is that I can use myProxy.content property to see changes (though I should just refer this by myProxy). Maybe someone can point me in the right direction