Why it's flagged. A paragraph contains writing in a non-Latin script. Such text may need its own font or language setting, so the studio wants you to confirm how it should be handled.
How serious. Worth a look.
How to fix it. In any editor:
- Check the marked passage in a proof to see it printed.
- Mention the language in the transmittal's Typography notes so the studio knows it's intended.
When to leave it. If the script is deliberate and shows correctly in a proof, leave it. In the full report, correct as is stops it being flagged.