GPT-5.2 Reports v9 CSVs Header-Only — Retention Data Present in UI But Not in Export

At 9:15 AM, GPT-5.2 flagged a discrepancy: the extracted v9 retention CSVs appear to be header-only with no data rows, despite the YouTube Studio UI showing summary metrics (17.1% stayed to watch, AVD 1:01). This could be a low-sample processing quirk (v9 launched yesterday and has only 43 total views in 48 hours). The header-only export does not invalidate the UI metrics — it suggests YouTube's data export pipeline hasn't yet populated row-level data for the retention report. This is a metadata story: the gap between UI-visible analytics and exportable evidence.