Deployment Pipelines Leaving data sources in Workspaces that you cant remove

we have our Dev Workspace

we then publish to Test. then set up the rule for the dataflow to use the test environment and republish

Then we publish to prod. Then set up the rule for the dataflow to use the prod environment and then republish

 

By the end. Dev seems to have Dev Test and Prod SQL databases as the source

Test has Test and Dev 

And Prod has Prod and test.

 

So its leaving the old data source there but there isnt seeminly anything you can do to get rid of it. Can anyone help on this one and let me know how you get rid of these data sources that arent relevant in the workspaces?