Error archiving a task (chat)

Additional information:

The affected “00 - Narita Arrival (Chiba)” task is internally identified as a Codex task associated with the Japan 2028 project. Therefore, the more likely chain is:
project-associated task → project-specific rollout path handling → \?\ prefix retained → archiving fails
Chat mode may correlate with it, but the evidence does not yet prove that Chat mode causes it.
Add these observations to the issue:

• Only tasks created inside a project have failed so far.
• Comparable projectless tasks archive normally.
• Affected tasks contain \?\ in threads.rollout_path.
• Removing only that prefix allows archiving.
• Opening or updating the task can restore the prefix.
• The same path behavior occurs on another Windows computer.
• No unusual CODEX_HOME, links, or path configuration exists.

What version of the Codex App are you using (From “About Codex” dialog)?

Version 26.814.41957

What subscription do you have?

ChatGPT Plus

What platform is your computer?

Windows 11

What issue are you seeing?

Task title: 00 - Narita Arrival (Chiba)
Task ID: 01a01200-0683-7092-9d53-7714a106c547
Error: thread-store internal error: The system cannot find the file specified. (os error 2)

What steps can reproduce the bug?

Feedback ID: 01a015a7-8d2b-73b2-8ec3-e037c43962d1

What is the expected behavior?

The task should archive without any issues

Additional information

No response

Start by reproducing the archive failure on Windows 11 with the project-associated task 00 - Narita Arrival (Chiba), comparing it with a projectless task. Inspect the affected threads.rollout_path value and the behavior after opening or updating the task; done means the task archives successfully without requiring manual removal of the \?\ prefix.