I am receiving 400 GPT-OSS-20b structured output

I am using strict mode and the model is failing to genereate valid json. Is this expected?

GroqException - {\“error\”:{\“message\”:\“Failed to generate JSON. Please adjust your prompt. See ‘failed_generation’ for more details.\”,\“type\”:\“invalid_request_error\”,\“code\”:\“json_validate_failed\”,\"failed_generation\