RETRACTED 2026-09-22 bench artifacts (TC-NET-604 'freeze' campaign). Their 'STALL/WEDGE' verdicts were artifacts: (1) in-firmware non-echoing readers (Phase 9/11, probe) ate the peer's bytes; (2) probe_classify.py mode A/C misreported passing runs as STALL. TC-NET-604 is CLOSED as NOT-A-DEFECT (see docs/问题记录/CH395F_Trap_Records.md Trap 21). Do NOT use these recipes/verdicts for freeze detection. Trustworthy tools (kept one level up): ftp_freeze_probe.py (real FTP path + RETR SHA-256), ftp_abort_probe.py (abort/reconnect), bench_verdict.py (script-level STEP truth).