[BUG] macOS: desktop app sidebar drops ~80% of Cowork sessions since cloud/local unification — full history visible on claude.ai web

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?

Since the cloud/local unification update (~July 10, 2026), the macOS desktop app's session history sidebar shows only a fraction of actual activity. With 8-10 sessions/day of heavy Cowork usage, the timeline skips entire days (e.g. jumps from "Yesterday" directly to Jul 15). Missing entries are predominantly Cowork sessions.

The same account viewed on claude.ai web shows the COMPLETE list, updating live — sessions created minutes ago appear on web immediately while remaining absent from the desktop app. Data is intact server-side; the desktop client's session list is what's wrong.

Diagnostics already performed (all ruled out):

• Sidebar filters confirmed wide open: Type=All, Status=All, Last activity=All
• Setting Type=Task shrinks the list further (~3 tasks over a two-week span despite daily Cowork use)
• Multiple app updates applied, including current 1.22209.0
• Sign out/sign in, full quit/relaunch
• Full local cache rebuild: moved IndexedDB, Local Storage, fcache, Cache, Code Cache, Session Storage aside in ~/Library/Application Support/Claude; app rebuilt all of them fresh from the server — identical truncated list. This rules out stale local cache; the desktop client's fetch/merge of the session list appears to return incomplete results at the source.

Steps to reproduce:

1. Account with heavy daily Cowork usage in the desktop app on macOS
2. Open session history, set all filters to All
3. Compare against claude.ai web for the same account — desktop is missing most recent Cowork sessions and entire days
4. Rebuild local caches — no change

Screenshots attached below: desktop truncated list with filter panel open vs. complete claude.ai web list, same account, same days.

Related: #45076, #72179, #57227 (closed, reinstall-specific). This report differs in that the full cache-rebuild diagnostic has been performed and eliminated, and the web/desktop discrepancy is documented on a current version.

What Should Happen?

The desktop app should show the same complete session list that claude.ai web shows for the same account.

Error Messages/Logs

Steps to Reproduce

1. Use an account with heavy daily Cowork usage (8-10 sessions/day) in the Claude desktop app on macOS, on a version after the cloud/local unification (~July 10, 2026)
2. Open the session history sidebar and set all filters to All (Type=All, Status=All, Last activity=All)
3. Compare against claude.ai web for the same account
4. Desktop is missing most recent Cowork sessions and skips entire days; web list is complete and updates live
5. Quit app, remove local caches (IndexedDB, Local Storage, fcache, Cache, Code Cache, Session Storage), relaunch — caches rebuild fresh from server but the list is identically truncated

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

Unknown — before the cloud/local unification push (~July 10, 2026)

Claude Code Version

1.22209.0 (Claude Desktop app, macOS)

Platform

Other

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

Platform is the Claude Desktop app with a Claude.ai subscription (not API) — selected "Other" as the closest option; Terminal/Shell not applicable (UI bug). Side-by-side screenshots (truncated desktop sidebar with filter panel open vs. complete claude.ai web list, same account, same days) will be attached in a follow-up comment.