Headers are jumping while scroll in reverse direction

[TatsuUkraine]

So case here. I need to build infinite list in both directions (aka Schedule view in Google calendar app). Headers are positioning correctly when only forward or only reverse list is visible inside Viewport. But when both lists are shown - sticky header start to jumping during scroll. It seems that position is calculating with delay or calculating in a wrong way.

Code sample

              CustomScrollView(
                center: _centerKey, // UniqueKey()
                slivers: <Widget>[
                  SliverList(
                    delegate: SliverChildBuilderDelegate(
                      (BuildContext context, int index) {
                        return StickyHeader(
                          header: new Container(
                            height: 50.0,
                            color: Colors.blueGrey[700],
                            padding: new EdgeInsets.symmetric(horizontal: 16.0),
                            alignment: Alignment.centerLeft,
                            child: new Text('Header #$index',
                              style: const TextStyle(color: Colors.white),
                            ),
                          ),
                          content: new Container(
                            child: Text("Content #$index"),
                            color: Colors.orange,
                            height: 400,
                            width: double.infinity,
                          ),
                        );
                      },
                    ),
                  ),
                  SliverList(
                    key: _centerKey,
                    delegate: SliverChildBuilderDelegate(
                      (BuildContext context, int index) {
                        return StickyHeader(
                          header: new Container(
                            height: 50.0,
                            color: Colors.blueGrey[700],
                            padding: new EdgeInsets.symmetric(horizontal: 16.0),
                            alignment: Alignment.centerLeft,
                            child: new Text('Header #$index',
                              style: const TextStyle(color: Colors.white),
                            ),
                          ),
                          content: new Container(
                            child: Text("Content #$index"),
                            color: Colors.orange,
                            height: 400,
                            width: double.infinity,
                          ),
                        );
                      },
                    ),
                  )
                ],
              ),

And some issue visualization: https://i.ibb.co/ZLJvwsG/sticky-jump.gif

[slightfoot]

Please retest with sticky_headers 0.3.0