Candidate92f1042d8c against main8d3b061121; Linux x64 fs-39; real web development server; Claude Opus5.5 CLI2.1.303.
Same synthetic reproduction: background P2 sleeps30 then foreground nested C2 sleeps90; S2 sleeps210. User turn sleeps75 during C2 completion. S2 completion idle wakes continuation.
[2026-10-22T10:44:33.834Z] {"subtype": "task_started", "task_id": "add9fe31581090a08", "spawn_depth": 1, "is_backgrounded": true}
[2026-10-22T10:44:34.828Z] {"subtype": "task_started", "task_id": "a2456f79a9b9ea670", "spawn_depth": 1, "is_backgrounded": true}
[2026-10-22T10:45:14.714Z] {"subtype": "task_started", "task_id": "af6515f77f0bdf14c", "spawn_depth": 2, "is_backgrounded": false, "parent_task_id": "add9fe31581090a08"}
[2026-10-22T10:45:18.525Z] {"subtype": "task_progress", "task_id": "af6515f77f0bdf14c"}
[2026-10-22T10:46:51.558Z] {"subtype": "task_notification", "task_id": "af6515f77f0bdf14c", "status": "completed", "summary": "CHILD_DONE"}
Run (7, 'completed', '2026-10-22T10:44:30.162Z', '2026-10-22T10:44:36.111Z')
Run (8, 'completed', '2026-10-22T10:46:34.906Z', '2026-10-22T10:47:54.778Z')
Run (9, 'completed', '2026-10-22T10:48:13.429Z', '2026-10-22T10:48:16.342Z')
Nested child ('node:provider:claudeAgent:native-item:task%3Aaf6515f77f0bdf14c', 'completed', '2026-10-22T10:48:13.848Z', '2026-10-22T10:48:13.849Z')
Running subagents 0
UI: Lineage (no running count); no Waiting on subagent banner; root reports both agents done.
Recording started10:44:29.086 UTC; prompt submitted10:44:30; user follow-up10:46:34.906 UTC; continuation complete10:48:16.342 UTC.
Rendering: Chromium headless154; viewport1280x800 CSS pixels; DPR2; no device emulation; light theme (corrected after screenshot inspection); default font scaling. Screenshots are supplemental observed state, not pixel-equivalent render fixtures.