Dart Debug Extension on Chrome stopped working after Flutter 3.32.0 and Dart 3.8.0 update

[Ajay9o9]

After updating Flutter to version 3.32.0 and Dart to 3.8.0 stable, the Dart debug extension in Chrome no longer works when running Flutter web apps.

Environment:

Flutter: 3.32.0 (stable)
Dart: 3.8.0 (stable) (Wed May 14 09:07:14 2025 -0700) on macos_arm64
OS: macOS 15.5 (Build 24F74)
Chrome: Version 136.0.7103.114 (Official Build) (arm64)
VS Code: 1.99.3 and 1.100.0-insider

Flutter Doctor Summary:
[✓] Flutter (Channel stable, 3.32.0, on macOS 15.5 24F74 darwin-arm64, locale en-US) [✓] Android toolchain - Android SDK 34.0.0 [!] Xcode - issues noted (Simulator not installed, CocoaPods outdated) [✓] Chrome - develop for the web [✓] Android Studio 2025.1.2 [✓] VS Code versions 1.99.3 & 1.100.0-insider [✓] Connected devices (2 available)

Reproduction Steps: Running a Sample Flutter App on Web (Web Server)

Update Flutter to 3.32.0 and Dart to 3.8.0

1. Create a New Flutter App

flutter create sample_app
cd sample_app

2. Run the App on Web Using Web Server (Port 7456)

flutter run -d web-server --web-port=7456

3. Access the App in Your Browser

• Open your browser and navigate to:
  http://localhost:7456

5. Expected Result

• The Flutter counter app should load in your browser, served by the Flutter web server on port 7456.
• The Dart Debug extension in chrome should automatically activate, and allowing user to continue with development properly.

6. Current Result

• The Dart Debug extension does not activate when running with the web server, so debugging features are unavailable.

Run Flutter web app using:
flutter run -d web-server --web-hostname localhost --web-port 7357
Attempt to debug using Dart Debug extension on Chrome

Observe debug extension is disabled in extensions, so failing to attach or respond

Expected Behavior:
Dart Debug extension should work as before (not disabled) and attach to the running Flutter web app for debugging.

Actual Behavior:
Dart Debug extension fails to function after update.