[BUG] "Thought for ... s" line is updated in the past dialogue

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 Claude Code extension in VSCode, I have run a request and the AI was working on something and outputing, meanwhile I scrolled up in the same dialogue and opened one of the old "Thought for ... s" entries (that was already finished). Unexpectedly, the value in seconds changed for this and all other such old entries from being in range 1-300 seconds (which was accurate) to 8000-50000 seconds. The Claude was still working and outputting in the same dialogue. The new values look like maybe it has calculated the time since this message was posted until now, which for different entries was from 1 hour (~8000s) to ~12 hours (~50000s) ago.

<img width="276" height="245" alt="Image" src="https://github.com/user-attachments/assets/fe1dde2a-f8d4-4263-96d8-1890b2829fd2" />

<img width="888" height="375" alt="Image" src="https://github.com/user-attachments/assets/42bde07d-dcf8-4897-8026-f735475fc178" />

What Should Happen?

The displayed value in seconds shouldn't change once the thought step was finished.

Error Messages/Logs

Steps to Reproduce

1. Start a dialogue with Claude Code extension in VSCode. Ask something that will result in "Thought for ... s" entry to appear in the dialogue.
2. Leave it for some time.
3. In the same dialogue, ask it to do something that takes time. While it is thinking and outputing, scroll to an old "Thought for ... s" entry and click it.

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.177

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_