Downloading PBIX from Service breaks dataset

After speaking with Microsoft support they were just as confounded as I was originally.  However, after some research they did discover an interesting limitation outlined in the documentation.

After deployment, downloading a dataset (from the stage it's been deployed to) is not supported.

https://docs.microsoft.com/en-us/power-bi/create-reports/deployment-pipelines-process#limitations-1 

So basically, at least as it stands now, it appears you cannot download a dataset from a location in the pipeline other than it's original uploaded workspace.  Hopefully this will help others if they encounter the same issue.