OpenAI whisper model is generating '...' for non-english audios

I am using OpenAI whisper model to generate transcription for call recordings.
I am have verbose_json as response_format.
But intermittently, the model is generating ‘…’ as response sometimes.
We have identified this has happened only for non-english audio up until now.

Here is the sample image on what it generated

Also here the code snippet, if it helps.

with open(audio_file_path, "rb") as audio_file:
        return openai.Audio.transcribe("whisper-1", audio_file, response_format="verbose_json")
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