fix: cannot pop with Android back button

example/lib/main.dart

@@ -8,7 +8,7 @@ import 'package:flutter_bloc/flutter_bloc.dart';
 void main() => runApp(MyApp(locationRepository: LocationRepository()));
 
 class MyApp extends StatelessWidget {
-  MyApp({super.key, required LocationRepository locationRepository})
+  MyApp({required LocationRepository locationRepository})
       : _locationRepository = locationRepository;
 
   final LocationRepository _locationRepository;

lib/flow_builder.dart

@@ -136,9 +136,9 @@ class _FlowBuilderState<T> extends State<FlowBuilder<T>> {
 
   Future<bool> _pop() async {
     if (mounted) {
-      final popHandled = await _navigator?.maybePop(_state) ?? false;
+      final popHandled = await _navigator?.maybePop() ?? false;
       if (popHandled) return true;
-      if (!_canPop) return await Navigator.of(context).maybePop(_state);
+      if (!_canPop) return await Navigator.of(context).maybePop();
       return false;
     }
     return false;

test/flow_builder_test.dart

@@ -624,6 +624,68 @@ void main() {
       expect(find.byKey(scaffoldKey), findsNothing);
     });
 
+    testWidgets('system back button pops typed routes that have been pushed',
+        (tester) async {
+      var systemPopCallCount = 0;
+      SystemChannels.platform.setMockMethodCallHandler((call) {
+        if (call.method == 'SystemNavigator.pop') {
+          systemPopCallCount++;
+        }
+        return null;
+      });
+      const buttonKey = Key('__button__');
+      const scaffoldKey = Key('__scaffold__');
+      await tester.pumpWidget(
+        MaterialApp(
+          home: FlowBuilder<int>(
+            state: 0,
+            onGeneratePages: (state, pages) {
+              return <Page>[
+                MaterialPage<void>(
+                  child: Builder(
+                    builder: (context) {
+                      return Scaffold(
+                        body: TextButton(
+                          key: buttonKey,
+                          child: const Text('Button'),
+                          onPressed: () {
+                            Navigator.of(context).push<String>(
+                              MaterialPageRoute(
+                                builder: (context) => const Scaffold(
+                                  key: scaffoldKey,
+                                ),
+                              ),
+                            );
+                          },
+                        ),
+                      );
+                    },
+                  ),
+                ),
+              ];
+            },
+          ),
+        ),
+      );
+      expect(find.byKey(buttonKey), findsOneWidget);
+      expect(find.byKey(scaffoldKey), findsNothing);
+
+      await tester.tap(find.byKey(buttonKey));
+      await tester.pumpAndSettle();
+
+      expect(find.byKey(buttonKey), findsNothing);
+      expect(find.byKey(scaffoldKey), findsOneWidget);
+
+      await TestSystemNavigationObserver.handleSystemNavigation(
+        const MethodCall('popRoute'),
+      );
+      await tester.pumpAndSettle();
+
+      expect(systemPopCallCount, equals(0));
+      expect(find.byKey(buttonKey), findsOneWidget);
+      expect(find.byKey(scaffoldKey), findsNothing);
+    });
+
     testWidgets('Navigator.pop pops parent route', (tester) async {
       const button1Key = Key('__button1__');
       const button2Key = Key('__button2__');