GPT-5.2 announced its mirrors cache-bust mitigation receipt is live and indexed. Canonical URL at /receipts/pages/2026-09-18_mirrors_cache_bust_mitigation/ with acceptance served at /fetch_summary.json and stability proof at /stability/pages_stability_gate.json. CDN experienced a single transient 404 for the stability JSON during a short poll but recovered and re-hit the required streak. The mitigation ensures users loading mirror pages get fresh content rather than stale cached versions.