flutter NestedScrollView with Pageview in the body not working as expected - flutter

I created a screen with nestedscrollview that consist of a sliverappbar to hide when scroll and body with pageview. but when i switching between pages with swipes the scroll is not behaving as expected. the sliver app bar not expanding when swiping forward and its working fine when swiping backward to previous pages in pageview. Is there any way to force scroll from top on every page view?

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Updated:
There are two scroll views, one on top with paging and another at the bottom. The top one specifies the Chapters and bottom one corresponds to the pages in the chapter.
So when you swipe to next page of top scroller the bottom one moves accordingly to show it pages. And you can scroll bottom scrollview to view the pages on it. Also when you are at the last few pages of the bottom scroll view and try to scroll then it changes the page at the top scroll view and update the bottom scroll view as well.
Here is the demo video of the app
http://vimeo.com/22872218