Provider is not updating my ListView – Singleton – Flutter

I can’t figure why my widget ScrollViewStory won’t update when CurrentStoryModel.instance changes.

Is there a problem with the fact that CurrentStoryModel is a singleton ?

Here are the widgets:

class Story extends StatelessWidget {
  @override
  Widget build(BuildContext _) {

    return ChangeNotifierProvider<CurrentStoryModel>(
      create: (_) => CurrentStoryModel.instance,
      child: Expanded(
        // fill the whole space
        child: Container(
          decoration: BoxDecoration(
            border: Border.all(
              color: Colors.blue,
              width: 2,
            ),
          ),
          child: ScrollViewStory(),
        ),
      ),
    );
  }
}


class ScrollViewStory extends StatefulWidget {
  ScrollViewStory({Key? key}) : super(key: key);

  @override
  State<ScrollViewStory> createState() => _ScrollViewStoryState();
}

class _ScrollViewStoryState extends State<ScrollViewStory> {

  @override
  void initState() {
    super.initState();
  }

  @override
  Widget build(BuildContext context) {

    return Consumer<CurrentStoryModel>(
      builder: (context, currentStoryModel, child) => ListView.builder(
          itemCount: currentStoryModel.sections.length,
          itemBuilder: (BuildContext context, int index) {
            return new StorySection(section: currentStoryModel.sections[index]);
          }),
    );
  }
}

And my model:

class CurrentStoryModel extends ChangeNotifier {

  static final CurrentStoryModel _singleton = CurrentStoryModel._();

  // Singleton accessor
  static CurrentStoryModel get instance => _singleton;

  List<SectionModel> _sections = [];

  CurrentStoryModel._();


  List<SectionModel> get sections => _sections;

  // add new entry
  void addSection(SectionModel newSection) {
    _sections.add(newSection);
    notifyListeners();
  }
}

In another part of my code, I call addSection() and the new section is effectively added to the list. But my ListView won’t update…

Any help appreciated !
Thanks.

I don’t really know what to do…