openclaw - 💡(How to fix) Fix Bug: ControlUI session dropdown click shows flash but does not switch session (v2026.5.27)

This is a re-submission of #87997 which was closed by bots, but the issue persists on v2026.5.27.

Describe the bug

In ControlUI WebChat, the session dropdown (class="chat-controls__session-trigger", located at the top-right of the chat area next to the agent name) has a click issue. When you click a different session from the dropdown, the dropdown briefly flashes (closes and reopens for a split second) but the actual chat session does not switch. The session remains on the current one.

The left sidebar session list works correctly — clicking a session there does switch the chat view.

Steps to reproduce

1. Open ControlUI WebChat at /openclaw/ui
2. Click the button with class "chat-controls__session-trigger" at the top-right corner next to the agent name
3. A dropdown shows all sessions for the current agent
4. Click a different session from the dropdown
5. Observe: the dropdown just flashes momentarily, but the chat content never changes

Expected behavior

Selecting a session from the right-side dropdown should switch the chat view to that session, just like clicking a session in the left sidebar does.

Environment

• OpenClaw version: 2026.5.27 (updated from 2026.5.26 which also had this bug)
• Browser: Chrome (latest)
• Deployment: local gateway via Nginx reverse proxy, domain: claw.arderpanada.top
• Auth mode: token
• Provider: DeepSeek

Additional context

This was originally reported as #87997 and was closed by clawsweeper[bot] with the comment "Current main and the latest release already wire the top-right Control UI session picker to the same session-switching flow as the sidebar". However, the bug is still reproducible on v2026.5.27. The dropdown flash behavior suggests the UI triggers a re-render but the session switch RPC never reaches the gateway or gets overridden.

Related issues that may share the same root cause:

• #88208: Sessions list click unresponsive (v2026.5.27, regression, CSP blocking WebSocket to tunnel URL)

Please do not auto-close this issue without actual reproduction against v2026.5.27 or a later version that the reporter has confirmed fixed.