When a chat answer cites the IPCC AR6 report, citation chips frequently anchor to section 4.9 even when the relevant passage is from a different chapter or section. The root cause appears to be in how the report is chunked: the footnotes section, which is physically located towards the very end of the document (around section 4.9), is not being chunked appropriately and is likely being over-represented in the vector store. As a result, semantic search hits on footnote chunks instead of the actual body content, causing the highlight/scroll logic to consistently resolve to that region. Fix should address footnote exclusion during ingestion and verify that section-ID lookup fails loudly rather than silently defaulting to the last matched anchor.
When a chat answer cites the IPCC AR6 report, citation chips frequently anchor to section 4.9 even when the relevant passage is from a different chapter or section. The root cause appears to be in how the report is chunked: the footnotes section, which is physically located towards the very end of the document (around section 4.9), is not being chunked appropriately and is likely being over-represented in the vector store. As a result, semantic search hits on footnote chunks instead of the actual body content, causing the highlight/scroll logic to consistently resolve to that region. Fix should address footnote exclusion during ingestion and verify that section-ID lookup fails loudly rather than silently defaulting to the last matched anchor.