[BUG] Sub Agents have completed their tasks, but bottom Agents list include the completed subagent

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

<img width="1960" height="1724" alt="Image" src="https://github.com/user-attachments/assets/60a9756e-ff79-4394-853c-e1ae51965f22" />

What Should Happen?

The agents list dont include the completed subagent.

Error Messages/Logs

Steps to Reproduce

1. subagents mode
2. watch the agents list

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.143-20260509.2

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_