title: Unexpected stackexchange API behavior
body: <p>I'm using below API:</p>
  <p><a href="https://api.stackexchange.com/docs/questions">https://api.stackexchange.com/docs/questions</a></p>
  <p>I'd like to collect all questions that's updated for given T1 to T2 (by last_activity_date)</p>
  <p>However, when I try to add a comment to a question, I found it's not recognized as an &quot;updated question&quot;.</p>
  <p>Anything wrong?</p>
  <p>Shall I use some other API to get those questions that has comments added/updated/deleted recently?</p>
  <p>Thanks in advance</p>