[BUG] Time stacks up for thinking mode in vscode even after the response is completed

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?

In vs code extension for claude, after claude finishes its response with thinking, the thinking time keep stacking up unlimited

<img width="547" height="176" alt="Image" src="https://github.com/user-attachments/assets/ac584bfa-259f-452e-bed1-afa7c36b3db8" />

What Should Happen?

the time should not stack up.

Error Messages/Logs

Steps to Reproduce

turn on thinking mode in vscode and just run any prompt and as you keep clicking the thinking component the time keep changing.

Claude Model

Not sure / Multiple models

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.81

Platform

Other

Operating System

macOS

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_