When navigating back and forth, the Bloc's state might be closed?

Question

I'm using bloc with clean architecture.

The scenario:

I have this list from list I'm choosing on item then go to item screen (in this screen the number of requests displayed in red circle). when clicking the red circle i go to reuest screen where i can accept/decline request. when i go back i want the number in red circle to change.

My Solution & the issue:

so i can catch up with the changes from request screen and display it in details screen. I decided to use one RequestBloc Instance above the details screen. so in details screen& request screen i read the bloc from context. and that worked for me. but in one direction. so after accepting a request and go back to details screens the number of request changed,but when i try to go to request screen again I got this issue

** "StateError was thrown building _InheritedProviderScope<RequestsBloc?>(listening to value): Bad state: Cannot add new events after calling close"**

Some code: from list i go like this

onTap: () {
context.push(Routes.detailsRoute,
extra: ProductExtra(bloc: instance<RequestsBloc>(), Product: product));
},

in route file

return BlocProvider.value(
value:productExtra.bloc,
child: ProductDetailsScreen(Product: productExtra.product));

in details screen

//read the bloc

_RequestsBloc = context.read<RequestsBloc>();

go to request screen

context.push(Routes.requestRoute, extra: productExtra);

in routes file

return BlocProvider.value(
value: productExtra.bloc,
child: RequestsScreen());

in request screen i also read the bloc from context.

in general i tried to change the blocProvider value from level to level