If the job name has spaces in it, then it appears that the generated files for the bat step in the workflow plugin do not correctly escape the file paths and as a result the build ends up hanging. I chased around the code some, and it appears that this is coming from WindowsBatchScript in the durable task plugin. Also, when the build does hang, it does not seem to be possible to terminate it, I ended up having to delete the job folder manually while Jenkins was not running in order to get rid of the active build.

The workaround is to not have spaces in your job names, but our current naming patterns tend to have spaces and since everything else appears to handle them correctly, it seems like this plugin should as well.