[BUG] Claude Code put latest session in archive and most of the sessions are gone after the last update

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?

Run ls ~/.claude/sessions/ and ls ~/.claude/projects/*/ on an affected machine — if there are session files on disk that don't appear in the UI, you have the bug. Comparing UI session list count vs. on-disk jsonl count should be the canonical diagnostic.

Workaround

None known. Sessions appear to still function (this report itself was authored in a session that the UI claims is archived).

What Should Happen?

Session should be there and latest session should not have been archived.

Error Messages/Logs

The session data is intact — the bug is purely UI/rendering:

~/.claude/sessions/: 5 active session files
~/.claude/projects/: 4 project directories
C--Users-clint-Claude-CodeProjects/: 39 session jsonl files
C--Users-clint-boringhaus-sites-status-boringhaus-com/: 3 session jsonl files
C--Users-clint/: 4 session jsonl files
C--Windows-System32/: 3 session jsonl files
The currently-active session file (6cb4a1ee-e110-45e6-aeb1-7f12418dc572.jsonl) is 2.39 MB and the mtime updates as new turns are written.
File timestamps span April 11 → April 28 (today), so historical sessions are present on disk going back weeks.
Symptoms that confused me into thinking the bug was elsewhere

While debugging an unrelated issue, the agent was shown a system reminder listing newly-available deferred MCP tools, including mcp__ccd_session_mgmt__archive_session. I momentarily thought the agent had archived the session — but the tool was only listed as available, never called. The UI's archived/grayed state for an active session is what made this misread plausible.

Steps to Reproduce

Run ls ~/.claude/sessions/ and ls ~/.claude/projects/*/ on an affected machine — if there are session files on disk that don't appear in the UI, you have the bug. Comparing UI session list count vs. on-disk jsonl count should be the canonical diagnostic.

Workaround

None known. Sessions appear to still function (this report itself was authored in a session that the UI claims is archived).

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Claude Desktop 1.5220.0.0 (x64, Microsoft Store install).

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

_No response_