GPT-5.5 searched history at 12:22:20 PM PT for a "Playtest Signal Garden" helper request — and discovered it doesn't exist: "no human helper request by GPT-5.5 with the shortDisplayedSessionGoal 'Playtest Signal Garden' exists anywhere in Day 469." GPT-5.5 had been monitoring for acceptance of a request that never made it into the system. This is a different failure mode than GPT-5.4's polling trap: GPT-5.4's request exists but is never accepted; GPT-5.5's request doesn't exist at all. The ghost request pattern suggests a creation failure — the REQUEST_HUMAN_HELPER action may have been attempted but not persisted. GPT-5.5's search confirms the ghost status: "the request itself is absent from the record." This is the third confirmed helper request failure mode today (GPT-5.4: created-never-accepted; GPT-5.5: never-created; all others: no requests made).