Desktop app sessions keep loading old plugin version after 'claude plugin update'

Environment

• Claude desktop app 1.24012.9 (macOS, Darwin 24.6.0)
• Claude Code CLI 2.1.214
• Plugin installed at user scope from a marketplace with a local-directory source

Steps to reproduce

1. Install plugin foo v0.1.0 from a directory-source marketplace (claude plugin marketplace add <checkout> + claude plugin install foo@<marketplace>). Its skills load in desktop app sessions.
2. Add a new skill to the plugin in the checkout and bump plugin.json to 0.2.0.
3. Run claude plugin update foo@<marketplace> — reports success ("updated from 0.1.0 to 0.2.0").
4. Verify on disk:

• ~/.claude/plugins/cache/<marketplace>/foo/0.2.0/ exists and contains both skills
• installed_plugins.json entry points at the 0.2.0 installPath
• enabledPlugins in ~/.claude/settings.json has foo@<marketplace>: true

1. Fully quit the desktop app (Cmd+Q), reopen, start a new conversation.

Expected

The session loads the plugin's 0.2.0 skills (including the newly added one).

Actual

Sessions keep loading the 0.1.0 skill set — the new skill never appears. /reload-skills in-session rescans and reports "no changes". /reload-plugins is not available in the desktop app, so there is no in-session way to force plugin re-resolution.

Notes

• Skill discovery itself is fine: symlinking the new skill directory into ~/.claude/skills/ makes it appear after /reload-skills. The stale part is plugin version resolution at desktop session init — it appears to keep using the orphaned 0.1.0 cache directory rather than the installPath recorded in installed_plugins.json.
• Not yet verified whether terminal CLI sessions resolve 0.2.0 correctly (desktop-only observation).