Completed sub-agent remains shown as working after close

What version of the Codex App are you using (From “About Codex” dialog)?

26.814.5517.0

What subscription do you have?

Unknown

What platform is your computer?

Microsoft Windows NT 10.0.26100.0 x64

What issue are you seeing?

After a sub-agent completes, Codex Desktop continues to display it as working.

The parent task closed the completed sub-agent. The close operation reported that the agent was already completed:

{"previous_status":{"completed":null}}

The working indicator remained visible, making it unclear whether background work was still running. No project or user data was involved.

What steps can reproduce the bug?

1. Start a sub-agent from a Codex Desktop task.
2. Wait for the sub-agent to complete.
3. Close the completed sub-agent from the parent task.
4. Observe the sub-agent status in the desktop UI.

What is the expected behavior?

Once a sub-agent has completed and is closed, the desktop UI should stop showing it as working.

Additional information

This report concerns the Codex Desktop App, not the Codex CLI. The issue was observed on Windows.