We updated the Promotion builds to 2.24 to fix a specific issue,

https://issues.jenkins-ci.org/browse/JENKINS-27716

However, we are seeing a different issue now...

Our parent job pulls code from a git repo as a part of the build process.

Our promotion job does very little; it has an approval process, and, when approved, it calls a parameterized secondary job.

It appears that, for whatever reason, the promotion job (not the secondary job) now also tries appears to now perform SCM tasks, with the settings that match the parent job, before triggering the parameterized secondary job.