Android应用中Google Cloud Speech-to-Text V2设cmn-Hans-CN时遭CANCELLED错误

在Android（Java）应用中使用Google Cloud Speech-to-Text V2服务，设置languageCode为ja-JP或en-US时，流式识别功能可正常运行。但仅将语言代码切换为cmn-Hans-CN（或zh-CN）时，调用会立即失败并抛出CANCELLED错误。已确认相同代码与配置在ja-JP和en-US语言下可正常工作，尝试过cmn-Hans-CN和zh-CN两种语言代码均立即触发取消，且已验证网络连接与凭证有效。

环境与配置信息：

• 模型：chirp_2
• 端点：us-central1-speech.googleapis.com:443
• SDK：com.google.cloud:speech-v2:latest
• 平台：Android（Java）

相关代码片段：

// Build recognition config
RecognitionConfig config = RecognitionConfig.newBuilder()
    .setModel("chirp_2")
    .setLanguageCode("cmn-Hans-CN")  // ← 此处触发失败
    .build();
StreamingRecognitionConfig streamingConfig =
    StreamingRecognitionConfig.newBuilder()
        .setConfig(config)
        .build();

// Start streaming
try (SpeechClient client = SpeechClient.create(
         SpeechSettings.newBuilder()
             .setEndpoint("us-central1-speech.googleapis.com:443")
             .build())) {
    ClientStream<StreamingRecognizeRequest> stream =
        client.streamingRecognizeCallable()
              .splitCall(responseObserver);
    // First request with config
    stream.send(StreamingRecognizeRequest.newBuilder()
          .setStreamingConfig(streamingConfig)
          .build());
    // Then send audio data...
} catch (Exception e) {
    Log.e("SpeechTest", "Streaming failed", e);
}

错误日志：

com.google.api.gax.rpc.CancelledException: io.grpc.StatusRuntimeException: CANCELLED: The operation was cancelled.     at com.google.api.gax.rpc.ApiExceptions.callAndTranslateApiException(ApiExceptions.java:…)     at com.google.cloud.speech.v2.StreamingRecognizeClient.streamingRecognizeCallable(StreamingRecognizeClient.java:…)     … 05-14 16:42:40.052 26220 26279 E MyApp: com.google.api.gax.rpc.CancelledException: io.grpc.StatusRuntimeException: CANCELLED: The operation was cancelled.

内容的提问来源于stack exchange，提问作者Kelvin