Workflow does not run every time

Problematic PR: Consolidate text between UG and args spec (part 1 of 3) by emlys · Pull Request #36 · natcap/invest.users-guide · G
The Github Actions workflow has run erratically on this PR as you can see from how many commits have no checkmark or X next to them. The Checks tab shows no checks at all (different from when there’s a syntax error in the workflow YML). I reverted all changes to the workflow file and still nothing.

I closed that PR and opened a new one: Consolidate text between UG and args spec (part 1 of 3) by emlys · Pull Request #42 · natcap/invest.users-guide · G to try to trigger the workflow to run. Still nothing.