If the InitialOffset prop is set, the zoomableView "jumps" on the first pan...

[AVGHz]

As we had to render some pictures with different initial offsets for our project, we noticed that on the first pan the pictures are being repositioned to 0,0;
Our solution was to initialise the lastX and lastY to the props on mount; we patched the module locally for our project;
Maybe this will help somebody;

we inserted this in line 85 of ReactNativeZoomableView.tsx, just before componentDidUpdate

componentDidMount() {
    if(typeof(this.props.initialOffsetX)!=='undefined') {
        this.setState({
            lastX: this.props.initialOffsetX
        })
    }
    if(typeof(this.props.initialOffsetY)!=='undefined') {
        this.setState({
            lastY: this.props.initialOffsetY
        })
    }
}