In a FMEServerJobSubmitter transformer, the published parameters are not automatically updated.
So if you change the parameters of a workspace (create or delete parameters), and call that workspace via a FMEServerJobSubmitter, it will cause a problem.
When running a process on FME Server that has an outdated FMEServerJobSubmitter transformer in it, the process is not even called or you don't get an error message.
I would suggest to throw somekind of error message so you are aware that you have to update the FMEServerJobSubmitter transformer.