@cf/myshell-ai/melotts doesn't work in spanish

If i change lang: “en” everything works right, the tts is in spanish with english accent because the input was in spanish. But if I change lang: “es” so it actually sounds good in spanish I get this error: AiError: 8002: Invalid input

Start by reproducing the reported TTS request with lang set to "en" and then "es" for @cf/myshell-ai/melotts, recording the 8002 error. Trace where the model request is validated or dispatched; done means Spanish input with lang "es" completes successfully and produces Spanish speech without the invalid-input error.

Written by the indexing model from the issue text.