Repository: flutter
Issue: Bold weighted Korean hangul text may be rendered incorrectly with variable fonts
Labels: platform-android,engine,a: internationalization,a: typography,platform-web,c: rendering,has reproducible steps,P3,team-engine,triaged-engine,found in release: 3.24,found in release: 3.27

### Steps to reproduce

1. Type bold Korean Text.
2. Use Android phone to run
3. Run app

Tested on Galaxy S9, Galaxy S23. Both of them produced same problem.

### Expected results

Text should be rendered clearly.




### Actual results

some of vowels and consonants in hangul bold text are rendered like wireframe.

![image](https://github.com/user-attachments/assets/68b68d7b-d8e7-4246-9a29-f473db930fe7)
![image](https://github.com/user-attachments/assets/9f8998af-0260-46c0-b7f2-fb59570c2a44)
![image](https://github.com/user-attachments/assets/87901250-450d-4f85-ac3c-e8ed7251d1d1)


### Code sample

<details open><summary>Code sample</summary>

Page: 
```dart
class NewFeaturesPage extends StatelessWidget {
  const NewFeaturesPage({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title:
            const Text('새로운 기능', style: TextStyle(fontWeight: FontWeight.w900)),
      ),
      body: const Placeholder(),
    );
  }
}
```

pubspec.yaml:
```yaml
  fonts:
    - family: Pretendard
      fonts:
        - asset: assets/fonts/PretendardJPVariable.ttf
```
 Same problem occurs if you don't specified font. Not necessary.

</details>


### Screenshots or Video

<details open>
<summary>Screenshots / Video demonstration</summary>

- In Android (in trouble)
![image](https://github.com/user-attachments/assets/68b68d7b-d8e7-4246-9a29-f473db930fe7)
![image](https://github.com/user-attachments/assets/9f8998af-0260-46c0-b7f2-fb59570c2a44)
![image](https://github.com/user-attachments/assets/87901250-450d-4f85-ac3c-e8ed7251d1d1)

- In iOS (not in trouble)

![IMG_5BEDAD871A24-1](https://github.com/user-attachments/assets/23e7ad49-e6e2-429a-9bd8-13fcb77aedd1)
![IMG_C7CF6AD70A9B-1](https://github.com/user-attachments/assets/53d7ddd5-b854-47e0-983f-27c822cfe94a)
![IMG_3AA7A0465480-1](https://github.com/user-attachments/assets/26501595-4b1c-4d24-bbec-831ca591217b)

</details>


### Logs

_No response_

### Flutter Doctor output

<details open><summary>Doctor output</summary>

```console
❯ flutter doctor -v
[✓] Flutter (Channel stable, 3.24.5, on macOS 15.1 24B83 darwin-arm64, locale ko-KR)
    • Flutter version 3.24.5 on channel stable at /Users/2p31/development/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision dec2ee5c1f (3 weeks ago), 2024-11-13 11:13:06 -0800
    • Engine revision a18df97ca5
    • Dart version 3.5.4
    • DevTools version 2.37.3

[✓] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
    • Android SDK at /Users/my-name/Library/Android/sdk
    • Platform android-34, build-tools 34.0.0
    • ANDROID_SDK_ROOT = /Users/my-name/Library/Android/sdk
    • Java binary at: /Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 17.0.11+0-17.0.11b1207.24-11852314)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 16.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Build 16B40
    • CocoaPods version 1.16.2

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2024.1)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 17.0.11+0-17.0.11b1207.24-11852314)

[✓] IntelliJ IDEA Ultimate Edition (version 2024.2.0.2)
    • IntelliJ at /Applications/IntelliJ IDEA.app
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart

[✓] VS Code (version 1.95.3)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.100.0

[✓] Connected device (6 available)
    • SM G965N (mobile)               • uid          • android-arm64  • Android 10 (API 29)
    • iPhone (mobile)                 • uid • ios            • iOS 18.0 22A3354
    • iPad (mobile)                   • uid • ios            • iOS 18.0.1 22A3370
    • macOS (desktop)                 • macos                     • darwin-arm64   • macOS 15.1 24B83 darwin-arm64
    • Mac Designed for iPad (desktop) • mac-designed-for-ipad     • darwin         • macOS 15.1 24B83 darwin-arm64
    • Chrome (web)                    • chrome                    • web-javascript • Google Chrome 131.0.6778.86

[✓] Network resources
    • All expected network resources are available.

• No issues found!

```

</details>