Not getting values when querying list in search bar implementation Flutter - flutter

Question

I need some help when implementing the search bar funcionality in Flutter.
I am implementing flappy_search_bar: https://pub.dev/packages/flappy_search_bar
However, it does return any value when I try to search something.
Is there anything I am missing? Seems trivial this kind of implementations, just query some list and include the results in other list but I cannot figure out the way to do it.
class MainPage extends StatefulWidget {
const MainPage({Key? key}) : super(key: key);
#override
_MainPageState createState() => _MainPageState();
}
class _MainPageState extends State<MainPage> {
TextEditingController textController = TextEditingController();
Future<List<dynamic>> search(String search) async {
await Future.delayed(Duration(seconds: 2));
List<dynamic> dogs = BreedList.where((dog) => dog['breed'].contains(search)).toList();
return dogs;
// return List(search.length, (int index) {
// return DogClass(breed: "$search $index");
// });
}
#override
void initState() {
super.initState();
}
#override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.white,
body: Column(children: [
Container(
margin: const EdgeInsets.only(top: 60, bottom: 15),
padding: const EdgeInsets.only(left: 20, right: 20),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Center(
child: Container(
width: MediaQuery.of(context).size.width -
(MediaQuery.of(context).size.width / 3.5),
height: 80,
child: SearchBar<dynamic>(
searchBarStyle: SearchBarStyle(borderRadius: BorderRadius.circular(20)),
onSearch: search,
cancellationWidget: Text('Cancel'),
emptyWidget: SizedBox.shrink(),
shrinkWrap:true,
onItemFound: (dynamic dogs, int index) {
return Container(
child: ListTile(
title: Text(dogs.breed.toString())
),
);
}),
//child: const Icon(Icons.search, color: Colors.white),
decoration: BoxDecoration(
borderRadius:
BorderRadius.circular(Dimensions.radius20),
color: Colors.white),
),
)
],
),
),
//wrapping with this widgets the scroll problem is solved in list
const Expanded(
child: SingleChildScrollView(
child: BookPageBody(),
)),
]));
}
}