Flutter bloc not adding event second time - flutter

Question

Hi I am using bloc named AuthenticationBloc to store the application auth status.
First of all here is the main.dart file.
void main() async{
runApp(MyApp());
}
class MyApp extends StatefulWidget {
MyApp({Key key}) : super(key: key);
#override
_MyAppState createState() => new _MyAppState();
}
class _MyAppState extends State<MyApp>{
#override
Widget build(BuildContext context) => BlocProvider(
create: (context) => AuthenticationBloc(),
child: Authentication(),
);
}
authentication.dart is like this.
#override
void initState() {
authenticationBloc = BlocProvider.of<AuthenticationBloc>(context);
authenticationBloc.add(AppLoaded());
super.initState();
}
#override
Widget build(BuildContext context) {
return MaterialApp(
home: BlocBuilder<AuthenticationBloc, AuthenticationState>(
builder: (BuildContext context, AuthenticationState state) {
if (state is AuthenticationInitial) {
return SplashScreen();
}
if (state is AuthenticationAuthenticated) {
return new Home();
}
if (state is AuthenticationNotAuthenticated) {
return MultiBlocProvider(
providers: [
BlocProvider<LoginBloc>(create: (context) => LoginBloc(authenticationBloc)),
],
child:new LoginPage(),
);
}
if (state is AuthenticationLoading) {
return SplashScreen();
}
return SplashScreen();
},
),
);
}
Now login_bloc.dart file is.
class LoginBloc extends Bloc<LoginEvent, LoginState> {
final AuthenticationBloc _authenticationBloc;
final repository = ApiRepository();
LoginBloc(AuthenticationBloc authenticationBloc)
: assert(authenticationBloc != null),
_authenticationBloc = authenticationBloc,
super(LoginInitial());
#override
Stream<LoginState> mapEventToState(LoginEvent event) async* {
if (event is LoginInWithEmailButtonPressed) {
yield* _mapLoginWithEmailToState(event);
}
}
Stream<LoginState> _mapLoginWithEmailToState(LoginInWithEmailButtonPressed event) async* {
yield LoginLoading();
try {
if (true) {
await Future.delayed(const Duration(seconds: 2), (){});
MySharedPreferences.instance.setStringValue('id', '1');
_authenticationBloc.add(UserLoggedIn(user: User(name:"abc",email:"abc#gmail.com")));
yield LoginSuccess();
yield LoginInitial();
} else {
yield LoginFailure(error: 'Something very weird just happened');
}
} on AuthenticationException catch (e) {
yield LoginFailure(error: e.message);
} catch (err) {
yield LoginFailure(error: err.message ?? 'An unknown error occured');
}
}
}
}
In login screen page when i log in then it successfully change the authentication-bloc state and navigated to home.
In home when i do like this
_authenticationBloc.add(UserLoggedOut()); the it successfully log out.
But after that when i click login it dispatch the event but the line
_authenticationBloc.add(UserLoggedIn(user: User(name:"abc",email:"abc#gmail.com"))); in login-bloc not working and so its not going to home.
Kindly help me why it is not dispatching the event to the bloc.
I am stucked at this point.
Thanks in advance.