If I use the CopyArtifact plugin with a workflow step(), it correctly pulls the latest successful build's artifacts when pointed to a project of type Workflow.

However, if I specify parameters for that same project, it will always throw an AbortException saying no build with those parameters could be found, regardless of what I entered in.

If I change the CopyArtifact to point to a freestyle project, the parameters correctly work as intended, pulling in most recent build that had those parameters.

Since the CopyArtifact is behaving as it should, I'm assuming there's a flaw in how the Workflow plugin is exposing its build Parameters.

Sample code:

step ([$class: 'CopyArtifact',
       projectName: 'Test Run Composer',
       target: 'composer_run',
       parameters: "PRODUCT=test,BRANCH_NAME=$branch_name"
      ]);