Which project does this relate to?

Router

Describe the bug

I have a parse function for path parameters, which throws a notFound error when the parameters aren't in the required format. For example:

export const Route = createFileRoute('/$id')({
  component: Home,
  params: {
    parse: ({ id }) => {
      const parsedId = parseInt(id, 10);

      if (Number.isNaN(parsedId)) {
        throw notFound();
      }

      return { id: parsedId };
    }
  },
  notFoundComponent: () => <div>Page not found</div>
})

However, this leads to a 500 error, not the 404 that I'd expect. Is this the correct behaviour or a bug? If it's expected, is there a way to get the 404 in this case?

See full example in this repository. I asked about this in the Discord here and was recommended to create this issue.

Your Example Website or App

https://github.com/matt-thomson/tanstack-validate-not-found/

Steps to Reproduce the Bug or Issue

See above

Expected behavior

I expect to see a 404 error, but instead I get a 500.

Screenshots or Videos

No response

Platform

• Router / Start Version: 1.134.9
• OS: Linux
• Browser: Firefox
• Browser Version: 144.0.2
• Bundler: vite
• Bundler Version: 7.1.7

Additional context

No response