It looks like it keeps repeating this operation until I terminate the process. If I re-open Duplicati it doesn’t repeat it until I try to choose that folder to be included either as Backup Destination or Source Data. Process is:
Add Backup, Configure New Backup, Enter any name, click Next, under Backup Destination, in Folder path navigate to C:\Users\Username\OneDrive\Dropbox and try to expand it.
The Duplicate interface at that point will just show the spinning loading icon on the folder and will keep repeating the above noted operation. CPU usage by the process shows 10% when it’s running.