Context is still empty when running the `head()` function.

[zugzwangm]

Which project does this relate to?

Router

Describe the bug

If you add something to the context via beforeLoad(), it will not be available inside head() after a full-page reload (F5). It will only be available after subsequent navigations (via <Link> for example).

Example

// routes/(app)/index.tsx
import { createFileRoute } from "@tanstack/react-router";

export const Route = createFileRoute("/(app)/")({
  beforeLoad: () => {
    return {
      getTitle: () => `Home`,
    };
  },
  component: Index,
});

function Index() {
  return (
    <h3>Welcome Home!</h3>
  );
}

// routes/__root.tsx
interface MyRouterContext {
  getTitle?: () => string;
  queryClient: QueryClient;
}

export const Route = createRootRouteWithContext<MyRouterContext>()({
  head: ({ matches }) => {
    const title = matches
      .filter((match) => match.context.getTitle)
      .reduce((acc, { context }) => {
        const title = context.getTitle!();
        return acc ? `${acc} - ${title}` : title;
      }, "");

    return {
      meta: [
        {
          title: `${title}`, // will be empty on a full-page reload
        },
      ],
    };
  },
  component: RootComponent,
});

function RootComponent() {
  return (
    <>
      <HeadContent />
      <Outlet />
      <Scripts />
      <TanStackRouterDevtools position="bottom-right" />
    </>
  );
}

Your Example Website or App

https://nbwiowazwkgithub-athu--3000--96435430.local-credentialless.webcontainer.io/

Steps to Reproduce the Bug or Issue

Create a simple project and use the code given in the example.
Notice the page title isn't set to "Home" on a full-page reload.

Expected behavior

In the given example, I expected the page title to be set to "Home" after a full-page reload (F5).

Screenshots or Videos

No response

Platform

{
  "dependencies": {
    "@tanstack/react-router": "^1.130.12",
    "@tanstack/react-router-devtools": "^1.130.13",
    "react": "^19.1.0",
    "react-dom": "^19.1.0",
  },
}

Additional context

No response

[brenelz]

I believe this is a duplicate of this one

#4785