When a job is triggered with additional parameters injected by the german-plugin, the rebuild-plugin does not populate them on rebuild.
The Wikimedia setup has Zuul/Nodepool/Gearman-plugin. A parameter OFFLINE_NODE_WHEN_COMPLETE is set when the build is triggered via the gearman-plugin. It does not exist in the list of the jobs parameter but the build does show it up being set properly.
When hitting [rebuild], previous parameters that are defined in the job configuration are populated from the previous build but the parameter OFFLINE_NODE_WHEN_COMPLETE that got injected is not.