Is this a bug report?

Yes.

The repro is simple. Scrolling using scrollTo does not trigger an onScroll event. No log will be printed in given example. However, if animation is enabled it works fine. Is this expected? On older versions of react native if wasn't this way (talking about 0.30.0).

componentDidMount() {
         this._svRef.scrollTo({x:0,y:100});
}
_handleScroll = (e) =>{
         console.log(e);
}
render(){
         return  <ScrollView ref={(x)=>this.svRef = x} onScroll={this._handleScroll}/>
}