My builds use this plugin to copy a parameter file from a slave back to the master Jenkins node, and then a subsequent build step sends that file to another job as a list of parameters (parameterized trigger).
There seems to be a race condition that I hit occasionally, where the downstream job is triggered with empty parameters. When I look on the master node, however, the parameter file is there/has been copied back successfully. If the same build is run again, it works. I suspect that somehow the copy is not happening/finishing before the downstream job is triggered.