I was having the problem yesterday that the GitHub API sometimes simply doesn't list an in progress workflow run in the output when I specifically filter for it:

"api.github.com/repos/{owner}/{repo}/actions/runs?status=in_progress" -> outputs 3 workflow runs

5 seconds later -> outputs 2 workflow runs

5 seconds later -> outputs same 3 workflow runs again

Apparently they make no guarantees of any type of consistency or continuity in output, which has the side effect of also making it completely useless.