It should have been implemented with an option to toggle it on or off. As it stands, this feature prevents archiving artifacts from working at all for aborted builds.

Change that went in most likely for JENKINS-3776:

https://github.com/jenkinsci/s3-plugin/commit/c6c79f720add41b1d575a4b5766021f9593c851b#diff-977bab281db08f86a0aef51ea5b8e0196ea48558929da8428756cca6fbdca12dR127