title: multiple forks in GitHub's
body: <p>I've tried to make a second fork of the same 3rd party project on github using these instructions:<br>
  <a href="https://adrianshort.org/create-multiple-forks-of-a-github-repo/" rel="noreferrer">https://adrianshort.org/create-multiple-forks-of-a-github-repo/</a><br>
  Unfortunately github doesn't allow me to create a pull request to upstream for such "fork" -  there is no such button and upstream's branch in drop down list. It seems it doesn't think that this is a fork at all - the project icon is different.<br>
  Apparently changes I did locally with <code>git remote add upstream</code> are 
  ignored by github server.  </p>
  
  <p>Any way to fix that?  </p>
  
  <p>What I want is two fully functional (PRs must work) forks of the same project under one github user account.</p>