[BUG] The custom statusLine command loses the branch indicator in ongoing sessions.

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?

The custom statusLine command loses the branch indicator in ongoing sessions. It works correctly when a new session is opened, but disappears once the session has been running for a while. Multiple people on our team can reproduce this. workspace.project_dir (or at least one of the workspace path fields) should remain populated throughout the session lifetime, not become null mid-session.

Open a new Claude Code session → branch indicator shows ✅
Continue the session, send several messages → branch indicator disappears ❌

What Should Happen?

Branch indicator should remain populated throughout the session lifetime, not become null mid-session.

Error Messages/Logs

Steps to Reproduce

To reproduce

Configure a statusLine command in ~/.claude/settings.json that reads branch from workspace.project_dir (or current_dir / cwd) and runs git rev-parse --abbrev-ref HEAD
Open a new Claude Code session → branch indicator shows ✅
Continue the session, send several messages → branch indicator disappears ❌

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Sonnet 4.6 and Opus 4.8

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_