silver of SliverStickyHeader over lapping the header

[mokaily]

The problem is shown in the GIF

the silver of the sticky header is overlapping from bottom !!

look at the bottom of the silver it keeps going up like the header is not exist !!

https://i.stack.imgur.com/ezU86.gif https://i.stack.imgur.com/VYOCA.gif

snippets

CustomScrollView(slivers: <Widget>[
          SliverToBoxAdapter(
            child: _slider(context),
          ),
          SliverStickyHeader(
            overlapsContent: false,
            header: Container(
                width: MediaQuery.of(context).size.width,
                child: TabBar(
                //some styling
                  tabs: [
                    //tabs
                  ],
                )),
            sliver: SliverFillViewport(
              delegate: SliverChildListDelegate([
                Column(
                  children: <Widget>[
                    Flexible(
                      child: TabBarView(
                        physics: NeverScrollableScrollPhysics(),
                        children: <Widget>[
                          Text("sd\nsd\nsd"),
                          Text("sd"),
                          Padding(
                            padding: const EdgeInsets.only(
                                top: 0, left: 8, right: 8),
                            child: OnlineDeals(),
                          ),
                        ],
                        controller: _tabController,
                      ),
                    ),
                  ],
                ),
              ]),
            ),
          ),
        ])

[letsar]

Mmmh it's maybe fixed in the 0.6.4, can you test?