title: Assign GitHub issue to more than 1 people
body: <p>I was able to do it, Now, I cant anymore.</p>
  <p>I have this message: <code>Assign up to 1 person to this issue</code>. If I select somebody else, <code>alan345</code> will be removed</p>
  <p><a href="https://i.stack.imgur.com/O9KkD.png" rel="noreferrer"><img src="https://i.stack.imgur.com/O9KkD.png" alt="enter image description here" /></a></p>
  <p>Is it a premium feature now?</p>