Trailing slash when SSR, otherwise ignored

Which project does this relate to?

Router

Describe the bug

I have a route config that looks like this:

routes/
├── app/
│   ├── games/
│   │   └── $gameId/
│   │       └── index.tsx
│   ├── index.tsx
│   └── route.tsx
├── __root.tsx
├── _auth.signup.tsx
├── _auth.signin.tsx
├── _auth.tsx
└── index.tsx

And the generated route tree looks like this:

/
/app
/app/games/$gameId
/signup
/signin

The issue I'm experiencing is with /app. If I soft-navigate from /signin there is no trailing slash, but if I hit refresh in the browser the URL turns into /app/. I'm guessing it's because of the index.tsx inside of the app folder, but I have set the trailingSlashes option to 'never' in the createRouter function. Is this expected?

GitHub repo: https://github.com/nikolovlazar/trivius/tree/48939a1989a36ff2728ce2f4f45f6c64c5efd43a

Your Example Website or App

https://stackblitz.com/edit/github-vajjdgwa?file=app%2Froutes%2Fapp%2Findex.tsx

Steps to Reproduce the Bug or Issue

1. Click on the link in the / page that takes you to /app
2. Note the URL: ends with /app - no trailing slash
3. Hit refresh and note the URL: ends with /app/ with a trailing slash

Expected behavior

Hard-navigating to the /app page should not add a trailing slash at the end.

Screenshots or Videos

No response

Platform

• OS: macOS
• Browser: Brave
• Version: 1.74.51

Additional context

No response

Start with the route config shown in the issue and the createRouter trailingSlashes option, then reproduce the behavior in the linked StackBlitz example or the provided trivius repository. Compare soft navigation from /signin with a browser refresh at /app; done means both paths preserve /app without adding a trailing slash.