Dispatch tab not showing responses — TypeError: Cannot read properties of undefined (reading 'includes')

Summary

The Dispatch (Cowork) tab in Claude Desktop is not displaying any responses from the agent, even though the backend is processing messages and generating responses correctly.

Environment

• OS: Windows 11
• Claude Desktop version: 1.569.0
• Claude Code (VM): 2.1.87

What's Happening

The Dispatch agent is receiving messages and generating responses successfully (confirmed via audit logs and cycle health logs). However, responses never appear in the Dispatch chat UI.

Confirmed working (backend):

• Audit log shows successful responses: "result": "Hey Fed! You're connected...", stop_reason: end_turn
• Cycle health reports: had_first_response: true, seconds_to_outcome: 8, cycle_health: healthy
• Messages show ✓ Read status in the UI

Confirmed broken (frontend):

• claude.ai-web.log shows repeated JS crash:

``
Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'includes')
``

• [REACT_QUERY_CLIENT] QueryClient error: Error: Not found on every Dispatch tab load
• [LocalAgentModeSessionManager] Bridge session: disabling renderer-dependent tools
• [spa] chunk preload failed, reloading TypeError: Failed to fetch dynamically imported module: https://assets-proxy.anthropic.com/...

Steps to Reproduce

1. Open Claude Desktop on Windows
2. Click the Cowork tab
3. Send any message (e.g. "Hello")
4. Message shows ✓ Read but no response ever appears
5. Check claude.ai-web.log — TypeError: Cannot read properties of undefined (reading 'includes') fires on every render

What Was Tried

• ✅ Restarted Claude Desktop multiple times
• ✅ Rebooted machine
• ✅ Cleared 211MB renderer cache (Cache/Cache_Data/)
• ✅ Disabled VPN (Surfshark) — CDN returns 200 after disabling
• ✅ Force hard-reloaded renderer (Ctrl+Shift+R)
• ✅ Confirmed winget shows 1.569.0 is the latest version — no update available

Impact

Dispatch is completely unusable. The Code tab works fine as a workaround, but persistent background agent sessions via Dispatch are inaccessible.