[Bug]: Plan sidebar opens empty after asking a follow-up question before implement

[sebherrerabe]

Before submitting

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

Area

apps/web

Steps to reproduce

1. Open T3 Code in the browser on localhost. (via npx t3)
2. Start a thread in Plan mode with Codex.
3. Wait until Codex generates a plan.
4. Do not click Implement yet.
5. Ask a follow-up question in the same thread.
6. Wait for the follow-up answer.
7. Click Implement.
8. The Plan sidebar opens automatically.

Expected behavior

When the Plan sidebar opens, it should show the plan that is being implemented.

Actual behavior

The Plan sidebar opens, but it is empty and shows "No active plan yet".

Impact

Minor bug or occasional failure

Version or commit

main

Environment

• Running the web app locally on localhost:3773 via npx t3 - Provider: Codex - Interaction mode: Plan - Env mode: Local - Browser: Edge - OS: WSL2 (Ubuntu)

Logs, stack traces, or screenshots

I can attach a screenshot. I did not see a crash or stack trace.

Workaround

No response