[BUG] Clicking "Move to New Window" causes chat to stop responding

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?

I am using the Claude Code VS Code extension version v2.1.116.

When I click the Claude Code extension icon and start a new chat, everything works normally at first. However, if I then click "Move to New Window", a new VS Code window opens with the chat as expected, but the chat that was already started before moving stops responding.

Expected Behavior:
The active chat should continue responding normally after being moved to a new window.

Actual Behavior:
The new window opens, but the chat that was already started before moving stops responding.

<img width="377" height="356" alt="Image" src="https://github.com/user-attachments/assets/ae21de06-443b-4173-abe6-2976ae2ca83d" />

What Should Happen?

Expected Behavior:
The active chat should continue responding normally after being moved to a new window.

Error Messages/Logs

Steps to Reproduce

Steps to Reproduce:

1. Open VS Code.
2. Click the Claude Code extension icon and start a new chat.
3. Click "Move to New Window".
4. A new VS Code window opens with the chat.
5. Observe the active chat.

Claude Model

None

Is this a regression?

I don't know

Last Working Version

v2.1.116

Claude Code Version

2.1.96 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_