Can't fork a side chat & side chats break after a period of inactivity.

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

Version 26.429.30905 (2345)

What subscription do you have?

pro

What platform is your computer?

_No response_

What issue are you seeing?

Open a side chat with /side. Hit fork. get error message: "Failed to fork chat'

<img width="307" height="165" alt="Image" src="https://github.com/user-attachments/assets/e6534a4d-efa9-485a-b710-e59c10e2766c" />

Also, if you don't use the side chat for a while, it breaks, you get a message along the lines of chat could not be found.

What steps can reproduce the bug?

Uploaded thread: 019ded3d-4c9b-7f02-9ba8-f1ace9a105d3

What is the expected behavior?

_No response_

Additional information

_No response_