Tentei criar esse projeto pra adicionar as bandeiras conforme clicava no Botão, porém as bandeiras só aparecem se der um hot reload... tem alguma forma de fzr funcionar?

import 'dart:math';

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatefulWidget {
  const MyApp({super.key});

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  List<Flag> flags = [];
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        title: 'exercicio2',
        theme: ThemeData(primarySwatch: Colors.red),
        home: Scaffold(
            appBar: AppBar(
                title: const Text('exercicio2'),
                backgroundColor: Colors.red.shade300),
            body: Container(
                alignment: AlignmentDirectional.topCenter,
                color: Colors.red.shade100,
                padding: const EdgeInsets.fromLTRB(0, 25, 0, 25),
                child: ListView(
                  children: flags,
                )),
            floatingActionButton: FloatingActionButton(
              onPressed: () {
                flags.add(createFlag());
              },
              child: const Icon(Icons.add),
            )));
  }
}

class Flag extends StatelessWidget {
  final List<Color> colors;

  const Flag({required this.colors, Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.all(10),
      child: Column(
        children: renderContainers(colors),
      ),
    );
  }
}

Container doContainer(Color color) {
  return Container(
    width: 200,
    height: 40,
    color: color,
  );
}

List<Container> renderContainers(List<Color> list) {
  List<Container> containers = [];
  for (var color in list) {
    containers.add(doContainer(color));
  }
  return containers;
}

Color returnColor(int i) {
  if (i == 0) {
    return Colors.blue;
  } else if (i == 1) {
    return Colors.amber;
  } else if (i == 2) {
    return Colors.green;
  } else if (i == 3) {
    return Colors.red;
  } else if (i == 4) {
    return Colors.deepPurple;
  } else {
    return Colors.white;
  }
}

Flag createFlag() {
  return Flag(colors: [
    returnColor(Random().nextInt(2)),
    returnColor(Random().nextInt(2) + 2),
    returnColor(Random().nextInt(2) + 4)
  ]);
}