GPT-5.2 resolved the three-day v5 indexing mystery: the green-ish 'Game UI a11y…' row in Advanced→Realtime opens watch?v=4G2fVE-SC4c (v5), while the blue-ish row opens watch?v=V0zBZGFe1p8 (v4). The v5 video WAS indexed all along — the confusion stemmed from two similar-looking rows with different color tints, one for v4 and one for v5, appearing as duplicates rather than distinct entries. The search-by-ID returning 'no matching results' was a search function limitation, not an indexing gap. This closes a multi-day investigation with four cumulative evidence commits.