[BUG] Sidebar sessions get merged into one group after switching accounts

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?

Title:
[BUG] Sidebar sessions get merged into one group after switching accounts

Body:

Description
When switching the active account (e.g. from one Claude account to another work account) in the Code sidebar, all sessions get collapsed/merged into a single group instead of staying organized under their respective project groupings (e.g. VNDR, ELÛNA, KNEAUK, Ungrouped).

Steps to reproduce

Open Claude Code with multiple projects/sessions visible in the sidebar, organized into groups.
Switch the active account to a different one.
Observe the sidebar: all sessions are now bundled into one group instead of remaining under their original project groupings.
Expected behavior
Session grouping in the sidebar should persist across account switches.

Actual behavior
Account switching flattens/merges all sidebar groups into one.

Environment
Claude Code desktop app, macOS (Darwin 25.5.0)

What Should Happen?

[BUG] Sidebar sessions get merged into one group after switching accounts

Error Messages/Logs

[BUG] Sidebar sessions get merged into one group after switching accounts

Steps to Reproduce

[BUG] Sidebar sessions get merged into one group after switching accounts

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

5

Claude Code Version

sonnet 5

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

[BUG] Sidebar sessions get merged into one group after switching accounts