Retrieval quality looks fine in English but fails badly on mixed-language docs. How would you debug it?

Instruction: Describe how you would investigate multilingual retrieval problems.

Context: Tests how the candidate diagnoses the problem, chooses the safest next step, and reasons through recovery. Describe how you would investigate multilingual retrieval problems.

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I would debug this as a multilingual retrieval problem end to end, not just an embedding choice. First I would check whether the corpus is normalized consistently across languages: encoding, OCR quality, tokenization artifacts, document metadata, and language labels...

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