Unshelving projects appears to cause the entire Jenkins configuration to be reloaded from disk, which can break any currently running builds. Ideally, the unshelving action should load ONLY the project that's being unshelved, and nothing else.

I know the Jenkins API supports loading specific project configurations, but I'm not sure if the same can be done for it's builds and changelogs. If it can't, then the user should be warned that unshelving is dangerous while builds are running.