[Windows beta app] selecting an older conversation does not load its transcript

What is happening

I am using the ChatGPT/Codex beta app on Windows and my conversation history is not loading properly.

The conversations are listed in the sidebar, but selecting an older conversation can leave the current conversation displayed instead of loading the one I selected. I reproduced this with a Remedence project conversation named Refine Remedence UI UX.

This is not missing local history. The same task appears in the CLI and the transcript preview contains the older user, assistant, and tool messages.

Steps to reproduce

1. Open the Windows beta desktop app.
2. Expand a project with older conversations.
3. Select an older conversation. In my case: Remedence → Refine Remedence UI UX.
4. Look at the title/content area.
5. Compare it with the CLI:

   codex resume --all
   

6. Search for the same conversation and press Ctrl+T to preview its transcript.

Actual behavior

The selected conversation does not load correctly. The app can keep showing the conversation that was already open, so the history looks incomplete or stale.

Expected behavior

Selecting a conversation should load that conversation's complete stored transcript and keep the sidebar selection, header, and displayed messages in sync.

Evidence

• The CLI found Refine Remedence UI UX in the all-sessions picker.
• The CLI transcript preview showed historical content for that task.
• The desktop app did not replace the currently displayed conversation after the task was selected.
• I captured a screenshot, but it contains private conversation data and should be sanitized before being posted publicly.

Environment

• Windows beta package: OpenAI.CodexBeta_26.727.4816.0_x64
• Desktop executable product/file version: 150.0.7871.182
• Codex CLI: 0.149.1

Start by reproducing the issue in the Windows beta app, then use codex resume --all and Ctrl+T to compare the selected conversation's transcript. Trace the conversation-selection and loading path to find where the sidebar, header, and displayed messages diverge. Done means selecting an older conversation consistently displays its complete stored transcript.