### What
Catch-all parallel slots were being incorrectly matched to the root of their segment. For example, `@foo/[...catchAll]/page` as a parallel route on `/page.tsx` should not match on `/`, but it should match on `/foo`, `/bar`, ...etc
### Why
The catch-all route normalization logic doesn't treat optional catch-all routes differently from catch-all routes. The assumption was if any catch-all route was found, that it should match the path that shared its prefix.
### How
This updates the normalization logic to handle optional-catchall as it was in the original implementation. For regular catch-all, we ensure that the catch-all base path (for `/[...slug]` that'd be `/`) isn't identical to the path we'd match it to.
Fixes#60613
Closes NEXT-2243
31a0edbd1b