Losing type-safety with merged routers

export const appRouter = router({
  users: usersRouter,
  test: {
    create: procedure.input(z.string()).query(({ input }) => {
      return 'Hi ' + input;
    }),
    list: procedure.input(z.string()).query(({ input }) => {
      return 'Hi ' + input;
    })
  }
})

export const usersRouter = router({
  create: procedure.input(z.string()).query(({ input }) => {
    return 'Hi ' + input;
  }),
  list: procedure.input(z.string()).query(({ input }) => {
    return 'Hi ' + input;
  })
});