Before I updated to the new version of the join plug-in, I only had to configure the Join Trigger to "Run post-build actions at join" and select Trigger Parameterized build of other projects and the project to build would get started with the correct parameters. I never had to configured "Projects to build once, after all downstream projects have finished".

With the new version of the plug-in, the only way to start the project is to configured the "Projects to build once, after all downstream projects have finished" setting. The project is getting started but now the parameters are not getting passed into the project.