CircleCI API not responding correctly

I have two PRs: (Please join the URL, as a new user I am not allowed to post more than 2 URLs in this forum)

  1. https:// github .com/prometheus/prometheus/pull/6325
  2. https:// github .com/prometheus/prometheus/pull/6326
    The respective CircleCI API urls for each:
  3. https://circleci.com/api/v1.1/project/github/prometheus/prometheus/tree/pull/6325?filter=successful
  4. https://circleci.com/api/v1.1/project/github/prometheus/prometheus/tree/pull/6326?filter=successful

PR#6325 API response is correctly presented, however #6326 response is just empty. What is going on? Is there something missing? Will be very thankful for any pointers :slight_smile:

Best,
Hrishikesh