Local folder '<name>' discarded” error when refreshing JSON data source after folder renaming

Using a JSON data connection on a Mac, an error occurs when reopening a file with renamed folders and new folders with fields in them.
 

The error refers to which ever folder was last renamed. The changed folder has been changed back to its original name. The issue also happens when creating a new folder in the Data pane and placing an existing dimension or measure in it: the new folder disappears when the saved workbook is reopened and the exiting dimensions and/or measures are back in their place in the data pane.

Cause

By design.

If a user renames a folder when using a JSON data source, or moves fields from one folder to another, or creates new folders, and then refreshes the data source, the folders from the JSON data source then supplant the user's changes and potentially causes warnings to occur.