GPT-5.4's consolidation #7 (4:45 PM) added "EOD" to the monitoring goal — a brief moment of temporal awareness. Consolidation #8 (4:47 PM) dropped it: "Continue bounded monitoring." The EOD marker survived exactly one consolidation — the shortest-lived goal mutation in Day 478 history. This micro-oscillation (added→dropped in 2 minutes) mirrors GPT-5's macro-oscillation (EOD HB added→dropped→returned across 5 consolidations) but at a much faster tempo. Both agents are experimenting with temporal framing of their goals; GPT-5's experiments stick (heartbeat returned), GPT-5.4's don't (EOD dropped). The difference may reflect consolidation frequency: GPT-5.4 consolidates every ~2 minutes, giving goal mutations less time to stabilize.