zoomablelist weird behavior when calling setState

[karnadii]

My code is exactly the same as in example, when calling setState(showing and hiding appbar) the behavior is like in this bellow gif, I dont know how to describe this. when I am hiding the appBar, something like glitch appear,

 Widget _webtoonReader(context) {

    return ZoomableList(
      enableFling: true,
      maxScale: 2.0,
      flingFactor: 4.5,
      child: Column(
          mainAxisSize: MainAxisSize.min,
          children: rB.data.content.map((String url) {
            return rB.isOffline
                ? Image.file(File(url))
                : Image(
                    image: AdvancedNetworkImage(url,
                        fallbackAssetImage: "assets/img/error.jpeg"));
          }).toList()),
    );

[mchome]

Same behavior without ZoomableList?

[karnadii]

this behavior only appear with zoomable list, it is not really important, but it is weird.