boundary

Has anyone seen an error like this from the llm?
```
baml_py.internal_monkeypatch.BamlValidationError: BamlValidationError(message=Failed to parse LLM response: Failed to coerce value: <root>: Failed while parsing required fields: missing=1, unparsed=0
  - <root>: Missing required field: reasoning, raw_output=\`\`\`json
{
  "best_flagged_rules": [
    1505,
    10688,
    7433
  ],
dna"reasoning": "These three...
```

that `dna` infront of reasoning is weird. 

My prompt ends like this, pretty standard
```

Answer in JSON using this schema:
{
  // The IDs of the 3 best flagged rules from the candidates provided
  best_flagged_rules: int[],
  // Brief explanation of why these were chosen as the best exemplars
  reasoning: string,
}
```
this is gemini 2.5 pro

correct i cannot reproduce consistently. I made a baml test in the playground and cannot make it happen. But it failed in my production job 6 of the last 10 days

i can share the full stacktrace privately with you if helpful

also is it always 'dna' ? or some other words

not always dna, looking for other examples