[BUG] Context isolation failure

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 have two repos, running in 2 different dev containers.
I am running Claude via the chat extension running INSIDE the dev container context

I just had Claude in one repo start attempting to make changes based on an instruction I issued IN THE OTHER REPO 10 minutes earlier and ignore the instruction I had just given it.

I have reviewed the entire set of chat instructions, and the only commonality in the chat that started making the changes (which was carrying out a review) was a reference to a "regionId" variable

What Should Happen?

Context for a conversation should not be shared between isolated instances

Error Messages/Logs

Steps to Reproduce

Beats me.

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.270

Platform

Anthropic API

Operating System

Other Linux

Terminal/Shell

WSL (Windows Subsystem for Linux)

Additional Information

_No response_