Flutter ontab click event not responsive

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Flutter

I am working on flutter footer navigation, I have a file where I initiate all parameters needed, like so:

  const Db5BottomNavigationBarItem({
    required this.icon,
    this.title,
    Widget? activeIcon,
    this.backgroundColor,
    required this.onTap,
  }) : activeIcon = activeIcon as String? ?? icon;

  
  final String icon;
  final String activeIcon;
  final Widget? title;
  final Color? backgroundColor;
  final Function onTap;
}

This is how I'm using it on my footer component:

child: Db5BottomNavigationBar(
         items: <Db5BottomNavigationBarItem>[
           Db5BottomNavigationBarItem(
             icon: db5_ic_home,
             onTap: () {},
           ),
           Db5BottomNavigationBarItem(
             icon: db5_ic_heart,
             onTap: () {
               Navigator.push(context,
                   MaterialPageRoute(builder: (context) => new Health()));
             },
           ),
           Db5BottomNavigationBarItem(
             icon: db5_ic_msg,
             onTap: () {},
           ),
           Db5BottomNavigationBarItem(
             icon: db5_ic_setting,
             onTap: () {},
           ),
         ],
         // currentIndex: _selectedIndex,
         unselectedIconTheme: IconThemeData(color: db5_icon_color, size: 24),
         selectedIconTheme: IconThemeData(color: db5_colorPrimary, size: 24),
         onTap: (int index) {
           setState(() {
             // _selectedIndex = index;
           });
         },
         type: Db5BottomNavigationBarType.fixed,
       ),

The problem is, once the button is clicked, let say the first:

onTap: () {
                Navigator.push(context,
                    MaterialPageRoute(builder: (context) => new Health()));
              },

No error at all, and, no response.
What am I doing wrong?

What I have tried:

onTap: () {
                Navigator.push(context,
                    MaterialPageRoute(builder: (context) => new Health()));
              },