ScrollablePositionedList with SliverAppBar not working properly

This is a repository to create a minimal reproducible example.

I want SliverAppBar hidden when ScrollablePositionedList.builder is Scrolled. This is the relevant piece of code I am including here.

          NestedScrollView(
              headerSliverBuilder: (context, innerBoxIsScrolled) => [
                    SliverAppBar(
                      backgroundColor: Colors.blue,
                      expandedHeight: 112,
                      snap: true,
                      pinned: false,
                      floating: true,
                      forceElevated: true,
                      actions: <Widget>[
                        IconButton(
                          icon: Icon(Icons.event),
                        )
                      ],
                      flexibleSpace: SafeArea(
                        child: Column(
                          children: <Widget>[
                            Container(
                              height: kToolbarHeight,
                              child: Column(
                                crossAxisAlignment: CrossAxisAlignment.center,
                                mainAxisAlignment: MainAxisAlignment.center,
                                children: <Widget>[
                                  Text(
                                    'Title',
                                    style: Theme.of(context)
                                        .textTheme
                                        .title
                                        .copyWith(
                                            fontSize: 16, color: Colors.white),
                                  ),
                                  SizedBox(
                                    height: 2,
                                  ),
                                  Text(
                                    'Date',
                                    style: Theme.of(context)
                                        .textTheme
                                        .caption
                                        .copyWith(
                                            fontSize: 10, color: Colors.white),
                                  ),
                                  SizedBox(
                                    height: 2,
                                  ),
                                  Text(
                                    'Another Text',
                                    style: Theme.of(context)
                                        .textTheme
                                        .subtitle
                                        .copyWith(
                                            fontSize: 14, color: Colors.white),
                                  ),
                                ],
                              ),
                            ),
                            Expanded(
                              child: Container(
                                height: kToolbarHeight,
                                width: MediaQuery.of(context).size.width,
                                color: Colors.white,
                                child: Row(
                                  mainAxisAlignment:
                                      MainAxisAlignment.spaceEvenly,
                                  children: <Widget>[
                                    Text(
                                      'Prev',
                                    ),
                                    Text(
                                      'Next',
                                    )
                                  ],
                                ),
                              ),
                            )
                          ],
                        ),
                      ),
                    )
                  ],
              body: ScrollablePositionedList.builder(
                  physics: ScrollPhysics(),
                  itemPositionsListener: itemPositionListener,
                  itemScrollController: _itemScrollController,
                  initialScrollIndex: 0,
                  itemCount: 500,
                  itemBuilder: (BuildContext ctxt, int index) {
                    return Container(
                        margin: EdgeInsets.all(16)
                        ,
                        child: Text('$index'));
                  })),

I tried two approaches so far none of them working properly,

Approach 1

I added physics: ScrollPhysics(), to ScrollablePositionedList.builder

Output:

Appraoch 2

I added physics: NeverScrollableScrollPhysics(), to ScrollablePositionedList.builder

SliverAppBar hides this time but now I can not scroll to the very end of ScrollablePositionedList.builder I have 500 items on my list but it scrolls up to only 14th item, see the output. Also, it lags too much on scroll

Output:

Thanks in advance.

Answering question myself

This problem has no solution for it. I have created an issue here

It looks like ScrollablePositionedList with SliverAppBar cannot work until Flutter Team does not add shrinkwrap property to ScrollablePositionedList.

Feature request to add shrinkwrap is created here