Fixing `NextRouter was not mounted` in Next.js

I wanted to programmatically change the route. So I looked up how to do it on the docs and found this:

'use client';
import { useRouter } from 'next/navigation';
export default function Page() {
  const router = useRouter();
  return (
    <button type="button" onClick={() => router.push('/dashboard')}>

Great. So I called useRouter() in my code, and let VSC import it for me:

I saw that the package names were different. I assumed the documentation was up to date. So I went with next/router and got this error on my page:

Clicking the link explains that it can happen in unit tests, in which case we should mock the router. Except I am not running a unit test. I tried both packages suggested by VSC, and got the same error.

Eventually I googled it, and they recommended to import useHistory from 'next/navigation', like the doc said. And indeed, it fixed it! I wonder why VSC did not suggest it at all.