CI: Caching issues at /pipelines

Steps to reproduce

  1. Open our pipelines. (Sorry, self-hosted EE) See this - even after refreshing the list: image
  2. Click on the first stage that appears to be running. It's actually done: image
  3. Click on the second stage that appears to be pending. It's actually running: image

This happens multiple times. It's not a timing issue, like, when I open /pipelines the first stage is still running, but when I click on it, it finished in the meantime.

Problem

Likely a cache issue.

Output of checks

Same as in https://gitlab.com/gitlab-org/gitlab-ee/issues/5347.