Issue 18877 real-app attempt, 2026-10-21 UTC
Main: 70e5e384dab96a1d1e4a253ee5a9415ed5d8ce30
Linux x64; Node 24.21.0; Claude CLI 2.1.303; claude-opus-5-5.
Setup: git fetch origin main; git worktree add /home/ubuntu/wt/issue-18877 origin/main
T3CODE_PROJECT_ROOT=/home/ubuntu/t3code node scripts/setup-worktree.ts
vp run migrate-dev-db --projects 2 --threads-per-project 2
vp run dev (isolated .t3; server 14959; web 6919)
Browser: built-in T3 preview, 1280x800.
Attempt 1: Default Codex selected inadvertently. Agent reported native Agent unavailable; no task started.
Attempt 2: Claude native Agent run_in_background:true, old-task, Bash sleep 600.
Parent ended; UI showed Running and Waiting on 1 subagent and 1 command.
Native task ID aea5b82ec1aecd48b.
Stopped owned dev session with Ctrl-C; restarted vp run dev.
Recovery log: terminalizedRuns: 1, stoppedSessions: 0.
Resumed parent created replacement fixture aa64e14815bcc5494.
Both agents returned early after starting background Bash timers.
SQLite read-only projection: both native subagents status=completed.
Asked replacement Claude to TaskStop original ID.
TaskStop result: No task found with ID: aea5b82ec1aecd48b.
No stopped terminal receipt for the original task was established.
Cleanup: clicked Stop for remaining background command; stopped owned dev server.
Result: incomplete reproduction; not evidence that the reported defect is absent.
Open maintainer fix stack already exists: GitCafe PRs 21724 and 21725.
Missing: live UI/session replacement sequence that keeps the native Agent open and causes old task's stopped notification after replacement.