Minimal reproduction for issue with TanStack Query 5.85.2

Steps

• install dependencies and run vite dev server

  npm install
  npm run dev

• visit the site (http://localhost:5174) with dev tools open

• notice that you are redirected to /fail and the pingResponse is null

  

• stop the vite server

• downgrade to @tanstack/[email protected]

  npm install @tanstack/[email protected]

• run vite again and visit the site and notice that you don't get redirected and the response is now available

  npm run dev