Flutter tab views build method runs even after navigation

Question

I have the following screens

Main Tabs Screen with multiple tabs. one tab is for listing products. On listing product screen i use navigator push to open product detail screen

Navigator.of(context).push(
      MaterialPageRoute(
        builder: (BuildContext context) {
          return ProductDetails(
            chatItems: mitem,
            currentUserId: widget.currrentUserId,
            groupChatId: mitem.groupChatId,
          );
        },
      ),
    );

on product detail screen and when setState is called i can see that main tab screen build method is also running. When i am navigated completey it should not run the build method