In my pipeline I have an implicitly loaded library and a non-standard project factory (`inline-pipeline` but reproducible with `pipeline-multibranch-defaults` too).

When I do `checkout scm` - the in-progress event not being sent.

I did the following as the very first step in my pipeline:

@NonCPS
def test() {
    echo currentBuild.rawBuild.getAction(com.cloudbees.jenkins.plugins.bitbucket.FirstCheckoutCompletedInvisibleAction.class).toString()
} 

And I can see a non-null echo message in the build log.

I think because in non-standard project factory it doesn't try to fetch a `Jenkinsfile` - the first ever checkout happening to the library and setting `FirstCheckoutCompletedInvisibleAction`. This is not reproducible with github branch source plugin which doesn't have an analogue to that action.