[BUG] Claude Code extension remove "claudeCode.environmentVariables" settings when IDE open

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="339" height="55" alt="Image" src="https://github.com/user-attachments/assets/4af15463-d519-4662-9a86-dc3b1537f827" />

"claudeCode.environmentVariables" in settings.json will removed when IDE open everytime

<img width="570" height="301" alt="Image" src="https://github.com/user-attachments/assets/1fec94da-1cf3-4686-b69e-2662493f676b" />

from here

What Should Happen?

Shoud not remove my settings

Error Messages/Logs

Steps to Reproduce

1、set "claudeCode.environmentVariables" in VS Code settings.json
2、reopen IDE

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.0.26

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_