Using @ to select a path isn't working if the entered text is not the last part of the path

Question

### What version of Codex is running?

0.5.14 (VSCode Extension)

### Which model were you using?

Any model

### What platform is your computer?

Mac Sonoma

### What steps can reproduce the bug?

Say you have a Next.js file, located at `/app/api/myname/route.ts`. Normally you could type `@myname` and it would show completions including the `/app/api/myname/route.ts`. This suddenly isn't happening - the only way to get that path is to type `@route.ts` which is annoying since it's an ambiguous f

Using @ to select a path isn't working if the entered text is not the last part of the path

What version of Codex is running?

Which model were you using?

What platform is your computer?

What steps can reproduce the bug?

What is the expected behavior?

What do you see instead?

Additional information