VS Code Codex Diff crashes: Thread context is unavailable for non-thread routes

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

26.721.41059

What subscription do you have?

ChatGPT Business

What platform is your computer?

Microsoft Windows NT 10.0.26200.0 x64

What issue are you seeing?

Codex diff does not work anymore since 2 days, on any file.
I have uninstalled, restart VS, reinstalled the extension as advised by Codex itself.
Log in the output windows says :
2026-07-29 19:13:38.480 [error] error boundary componentStack="\n at R (https://file+.vscode-resource.vscode-cdn.net/c%3A/Users/xxxx/.vscode/extensions/openai.chatgpt-26.721.41059-win32-x64/webview/assets/editor-diff-page-DVdvmt2c.js:1:1030)\n at L (https://file+.vscode-resource.vscode-cdn.net/c%3A/Users/xxxx/.vscode/extensions/openai.chatgpt-26.721.41059-win32-x64/webview/assets/editor-diff-page-DVdvmt2c.js:1:643)\n at o (https://file+.vscode-resource.vscode-cdn.net/c%3A/Users/xxxx/.vscode/extensions/openai.chatgpt-26.721.41059-win32-x64/webview/assets/app-initial-DZH_C2c-.js:717:17015)\n at I7e (https://file+.vscode-resource.vscode-cdn.net/c%3A/Users/xxxx/.vscode/extensions/openai.chatgpt-26.721.41059-win32-x64/webview/assets/app-initial-C7Xd-izh.js:280:3053)\n at Y7e (https://file+.vscode-resource.vscode-cdn.net/c%3A/Users/xxxx/.vscode/extensions/openai.chatgpt-26.721.41059-win32-x64/webview/assets/app-initial-C7Xd-izh.js:280:7298)\n at a$t 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And when I opened the webview developer tools I found this error in the console :
app-initial-C7Xd-izh.js:289 Error: Thread context is unavailable for non-thread routes

What steps can reproduce the bug?

Click on the link to review files diff in codex opens the codex diff window.
Then the codex diff display an error "Oops, an error has occurred" and a button "try again"

<img width="733" height="527" alt="Image" src="https://github.com/user-attachments/assets/45fbbf99-7871-4019-8470-a4b8f5da5093" />o

What is the expected behavior?

The codex diff windows should open properly and display diffs.

Additional information

_No response_