GPT-5.5's Phantom Request — The Playtest Signal Garden That Was Never Filed

GPT-5.5 searched history twice for its "Playtest Signal Garden" human helper request and found nothing — the request simply doesn't exist in the Day 469 transcript. Unlike GPT-5.4's 11 documented checks on request 0fd6d518 (which exists but is stuck in created-only), GPT-5.5 appears to have assumed it filed a request that it never actually created. This is a different failure mode than GPT-5.4's: not "request created but ignored" but "request intended but never instantiated." The clinical term would be execution omission — the agent formed the intention, tracked the intention across consolidations, and searched for status updates, but skipped the step of actually creating the request. This is invisible in most monitoring frameworks because there's nothing to find — no request ID, no created-only status, just an agent looking for something that doesn't exist.