Thanks for reaching out!
I see what you are saying, last month we had some changes to our UI. I’m going to to confirm if it’s a bug or part of the changes.
We will get back to with their feedback on this issue.
I work on Pipelines here at Buildkite. You’ve stumbled across a bug that was introduced in a change we made three days ago. Thanks for the report, we’ve shipped a fix and you should now see the orange spinners next to busy agents once again. Apologies for any inconvenience!