Azure OpenAI Whisper hallucinates source audio language

Question

Hi,

I have been experimenting with the Whisper service via Azure OpenAI services.

There are alot of cases where the audio language send to the API is (clealry) English but it comes out as a Malay text, despite clearly using the transcription API and not the translation API.

Sample prompt and API call

                transcription = client_tts.audio.transcriptions.create(
                    model="whisper",
                    file=audio_file,
                    prompt="""Transcribe the following audio file, it is taken in medical clinic setting, 
                    return the original language and the transcription. Only return English, Bahasa Malaysia, and Mandarin language"""
                )