[BUG] UI incorrectly shows Claude working

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?

When having a chat in Claude Code, the visual element showing a counter for how long the agent is working never stops, only resets after it's completed work. It completed a task, I left, came back, and while it was not working on anything, the counter had continued for over an hour.

The spinning/counting indicator persisted after the assistant response completed
It didn't stop on its own
Session was in Claude Code on the web

<img width="586" height="856" alt="Image" src="https://github.com/user-attachments/assets/e2671748-75c0-4752-8a17-9666fab5ec55" />

What Should Happen?

The visual element showing the counter should go away

Error Messages/Logs

The spinning indicator sometimes lingers in the UI after a response; it's a display artifact, not a sign I'm still processing.

Steps to Reproduce

Chat with Claude Code in a single, long-standing persistent chat thread. Send many messages back and forth where it reasons with you and writes code. Notice visual element does not go away.

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.152

Platform

Other

Operating System

macOS

Terminal/Shell

Other

Additional Information

I'm using Claude Code in Web Browser on Chrome on MacOS