Not sure which component is the real issue cause here, so tagging all.

We have a global grace period in Jenkins of 900s, a Gitblit installation with a post-receive hook triggering <jenkinsurl>/git/notifyCommit?url=<gitrepourl>, and a Multibranch pipeline configured on the gitrepourl.

When the git hook triggers a build or a multibranch indexing, the resulting builds are never keeping the global grace period, but are scheduled immediately.

I guess, when trying to reproduce, one could omit the hook and call the notifyCommit URL directly after pushing into the Git repository