CIRCLE_USERNAME not populated on squash merge with GH merge queues

Build Environment
1

With a gitflow type workflow on GitHub, it seems like CIRCLE_USERNAME doesn’t get populated on our default branch (which is getting squash merged into) on a specific project? For example, after a (squash) merge into develop in a more or less gitflow type setup, it seems to be unset (though on main / master, it is set).

I checked another project with a simpler trunk-based workflow, and it seems to be behaving as I’d expect on the default branch, with the user authoring the merge commit showing up as CIRCLE_USERNAME.

I opened a support ticket, but wonder if there could be anything (setup workflows? multiple default branch build feature?) that is causing this issue for this specific project?

edit: Probably relevant side note: we are using merge queues.

2

Support confirmed that this is because of merge queues.

It would be nice if there were alternate ways to surface this information in the case of merge queues specifically. I am checking to see if the new Slack notifications feature rolling out this month will support notifying the author (vs. committer) somehow.