Navigator.popUntil in WillPopCallback breaks the navigation

[EdStepashkin]

I encountered an issue where using Navigator.popUntil inside a WillPopScope (WillPopCallback) seems to break the navigation flow in my Flutter app.

Here are the details:

1. Navigate to a screen using 'MaterialPageRoute'.

   Example

          Navigator.push(
                  context,
                  MaterialPageRoute(builder: (context) => ScreenC()),
                );
      

2. Implement a WillPopScope with onWillPop that contains Navigator.popUntil.

   Example

      @override
        Widget build(BuildContext context) {
          return WillPopScope(
            onWillPop: () async {
              Navigator.popUntil(
                context,
                (route) => route.isFirst,
              );
              return false;
            },
            child: Container(),
          );
        }
      

3. Use the back gesture to navigate back.

Actual Behavior:
Instead, the navigation behaves unexpectedly, and I encounter issues with the navigation flow.
On my real project the screen freezes completely and is unresponsive.
On example project after swipe-to-go-back the navigation doesn't work anymore.

Video

Problem with ScreenA where I'm trying to navigate to ScreenA https://github.com/fluttercandies/ios_willpop_transition_theme/assets/22656185/0f636e7a-82e9-41c6-bdc6-94f4dea85342

Expected Behavior:

I expect the app to navigate back to the desired route.