Session visible in history but does not open after switching workspace

What version of the IDE extension are you using?

26.5417.40842

What subscription do you have?

Plus

Which IDE are you using?

VS Code

What platform is your computer?

Linux 6.17.0-22-generic x86_64 x86_64

What issue are you seeing?

A previously created Codex chat session is visible in the sessions/history tree in VS Code, but cannot be opened after switching workspaces.

Actual behavior:

• Session is visible in the history tree
• Clicking it does nothing (no UI update)
• No error message is shown

Additional context:

• Session files exist on disk under:

~/.codex/sessions/...

• Example structure confirmed via:

ls -R ~/.codex/sessions

• This suggests the session data is not lost, but the UI fails to rehydrate/open it

What steps can reproduce the bug?

1. Start a Codex chat in project/workspace A
2. Switch to another project/workspace B
3. Return to project/workspace A
4. Open Codex sidebar and click a previous session

What is the expected behavior?

The selected session should open and display the conversation.

Additional information

Environment:

• OS: Ubuntu 24.04.4 LTS
• Kernel: 6.17.0-22-generic x86_64
• IDE: VS Code
• Codex extension version: 26.5417.40842

Additional finding:

After installing Codex CLI, I was able to recover and open the session using:

codex resume --all

This confirms:

• Session data is intact
• CLI can correctly resume it
• VS Code extension fails to open the same session

This suggests the issue is specific to the VS Code extension session restore/rehydration logic, possibly related to workspace scoping or session binding.

Notes:

• CLI workaround consistently works
• Issue occurs specifically after switching workspaces