[Bug]: React #185 crash after sending a message when client clock lags server #2087

Before submitting

• I searched existing issues and did not find a duplicate.
• I included enough detail to reproduce or investigate the problem.

Area

apps/desktop

Steps to reproduce

1. Use a client machine whose clock is slightly behind the backend/server clock.
2. Open an existing thread.
3. Send a message such as ping.
4. Let the turn complete/settle.
5. The app can crash with the generic error screen showing Minified React error #185.

Expected behavior

The thread should settle normally, remain open, and mark itself visited without crashing, regardless of small client/server clock skew.

Actual behavior

Actual behavior

After sending a message and the turn completes, the app can enter an infinite update loop and crash with:

Minified React error #185

This corresponds to React's Maximum update depth exceeded.

Impact

Major degradation or frequent failure

Version or commit

Observed in stable and in nightly desktop client 0.0.18-nightly.20260416.46

Environment

Windows desktop app talking to a Linux backend over the network. Observed on: - Windows 11 desktop client - Linux backend - Backend/client clocks differed by roughly 0.6-0.7s, with the client behind

Logs or stack traces

Crash dialog:

`Minified React error #185; visit https://react.dev/errors/185 for the full message or use the non-minified dev environment for full errors and additional helpful warnings.`

Observed stack excerpt:

  
  Error: Minified React error #185
      at Bo (http://127.0.0.1:3773/assets/index-....js:9:52284)
      at markThreadVisited (http://127.0.0.1:3773/assets/index-....js:45:85080)

Root cause is the ChatView settled-turn effect calling markThreadVisited(...) without passing the server completion timestamp, so the client uses local wall-clock time and can loop forever when client_time < server_completedAt.

Screenshots, recordings, or supporting files

No response

Workaround

Temporary operational workaround: keep the client clock closely synchronized with the server clock.

Actual code workaround / fix:

In apps/web/src/components/ChatView.tsx, change:

markThreadVisited(scopedThreadKey(scopeThreadRef(serverThread.environmentId, serverThread.id)));

to:

markThreadVisited(
  scopedThreadKey(scopeThreadRef(serverThread.environmentId, serverThread.id)),
  activeLatestTurn.completedAt,
);

This avoids using client wall-clock time when marking a settled thread as visited and prevents the render loop when the client clock lags the server clock.