[Bug]: Voice guidance in Japanese doesn't sound properly

[yoshifuku-mai-dxe]

Is there an existing issue for this?

• I have searched the existing issues

Description of the bug

Sometimes, voice navigation in Japanese doesn't play properly and we can hear a sound like alert when we start route navigation in release build.
Or We can hear voice in Japanese and a sound like alert at the same time.
These bugs are detected only in Android device.

Flutter version

3.24.5-stable

Package version

0.4.0

Native SDK versions

• I haven't changed the version of the native SDKs

Flutter Doctor Output

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.24.5, on macOS 14.2.1 23C71 darwin-arm64, locale ja-JP)
[✓] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
[✓] Xcode - develop for iOS and macOS (Xcode 15.2)
[✓] Chrome - develop for the web
[✓] Android Studio (version 2024.2)
[✓] IntelliJ IDEA Community Edition (version 2024.3.2.2)
[✓] VS Code (version 1.66.0)
[✓] VS Code (version 1.96.0)
[✓] Connected device (3 available)
[✓] Network resources

• No issues found!

Steps to reproduce

1. Change device system language to "Japanese".
2. Build app in relese mode.
3. Open GoogleMapsNavigationView.
4. Start GoogleMapsNavigator.startGuidance().

Expected vs Actual Behavior

Expected behavior:
The navigation voice in Japanese playes always and a sound like alert isn't heard when GoogleMapsNavigator.startGuidance() started.

Actual Behavior:
sometimes, the navigation voice in Japanese doesn't playes and a sound like alert is heard when GoogleMapsNavigator.startGuidance() started.

Code Sample

Screen.Recording.2025-03-10.at.12.31.43.PM.mov

When we use Example App, same bug has been detected.
Please check around 0:23 of video.

*Video is the example of that navigation voice in Japanese and a sound like alert are heard at the same time.

Additional Context

The same problem seems to occur in languages ​​other than English.

[caio1985]

@ArturoSalazarB16 can you please verify?

[iwata-yasuaki]

By adding the following to android/app/build.gradle, Japanese audio is now played.

    buildTypes {
        release {
            signingConfig signingConfigs.release
            minifyEnabled false  // add
            shrinkResources false  // add
        }
    }

However, I think this package should play Japanese audio without doing the above.