[web] Text Scrambling in Flutter Web (WASM) with Dart 3.8.1 — Not reproducible in 3.8.0 #171596
Description
Steps to reproduce
- Create a new Flutter project using:
flutter create bug_demo
- Replace the contents of
main.dartwith a basic layout containingText()widgets. - Run using:
flutter run -d chrome --wasm
- Observe the scrambled/distorted text rendering on screen.
Expected results
Text should render clearly with correct spacing, no broken characters or letter misplacement.
Actual results
Text appears scrambled — with random spacing, broken alignment, and strange characters in the output.
Code sample
Code sample
import 'package:flutter/material.dart';
void main() => runApp(const MyApp());
class MyApp extends StatelessWidget {
const MyApp({super.key});
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: const [
Text('Uploading data, please wait...'),
Text('68 / 631 leads uploaded'),
Text('Duplicate leads found: 6'),
],
),
),
),
);
}
}Screenshots or Video
Screenshot
Logs
Logs
flutter run -d chrome --wasm
Launching lib/main.dart on Chrome in debug mode...
Debug service listening on ws://127.0.0.1:51345/7xIlU_PZlTI=/ws
Running with sound null safety
...
[Warning] Text rendering broken: some fonts show scrambled or misaligned characters.Flutter Doctor output
Doctor output
[✓] Flutter (Channel stable, 3.32.5, on macOS 26.0 25A5295e darwin-arm64, locale en-PK)
• Flutter version 3.32.5 on channel stable at /Library/Developer/flutter
• Framework revision fcf2c11572 (2025-06-24)
• Engine revision dd93de6fb1
• Dart version 3.8.1
• DevTools version 2.45.1
[✓] Android toolchain - develop for Android devices (Android SDK version 36.0.0)
• Android SDK at /Users/usamasarwar/Library/Android/sdk
• Platform android-36, build-tools 36.0.0
• Java version OpenJDK Runtime Environment Homebrew (build 17.0.15+0)
[✓] Xcode - develop for iOS and macOS (Xcode 16.4)
[✓] Chrome - develop for the web (version 138.0.7204.50)
[✓] Android Studio (version 2025.1)
[✓] VS Code (version 1.101.2)
[✓] Connected device (3 available): macOS (desktop), Chrome (web), iPad Air (simulator)
[✓] Network resources: All expected network resources are available.