App State Update working in Test Mode and Web, broken in app

I have a custom slider (implemented using the flutter_xlider package). I am setting the app state when the slider is dragged, like so:

onDragging: (handlerIndex, lowerValue, upperValue) {
          setState(() {
            FFAppState().update(() {
              FFAppState().sliderValue = lowerValue;
            });
            completeValue = lowerValue;
          });
        },

This app state is then used to show conditionally visible text widgets elsewhere on the page. There is also a button that becomes clickable once the app state sliderValue has a certain value.

In test mode and when published to web, everything works as intended. When I deploy to the app store, however, it seems like the app state is no longer updating. My conditionally visible text widgets never appear and the button is never clickable, despite the slider sliding around.

I'm stumped... any ideas?