Which project does this relate to?

Router

Describe the bug

When the RouterProvider is added anywhere in the Router as follows:
<RouterProvider router={getRouter()} context={{ isLoading: true }} />,
it throws this error
TypeError: Cannot read properties of undefined (reading 'subscribe')

Your Example Website or App

https://github.com/cjoecker/tanstack-error-reproduction-2

Steps to Reproduce the Bug or Issue

1. Start the project with npm run dev
2. See the server console

Expected behavior

The RouterProvider don't throw any error

Screenshots or Videos

No response

Platform

See reproduction project

Additional context

Line with error is here:

https://github.com/cjoecker/tanstack-error-reproduction-2/blob/5ea9366838bc4d929c05bf8b83d8f54fdec173d3/src/routes/__root.tsx#L43C8-L43C78