What version of Tableau Desktop are you using currently and how are you trying to refresh the data when connecting to ODATA V3?
The reason I ask is that I took the V3 link you provided about and connected to it in Tableau Desktop 10.5.1. I was able to connect to the link you provided with no issue and I was able to right-click the data source and refresh the data with no issue. If you're using an older version of Tableau Desktop, upgrading to the latest version may resolve the issue.
I saw the same behavior as you did with the ODATA V4 file, so that seems to be a problem with the data source.
If upgrading Tableau Desktop to the latest version doesn't resolve the issue, I recommend opening a ticket with Tableau Technical Support and seeing if they can help determine what's going on.
Hope this helps!
I just downloaded 10.5.1 and the issue still persists... but what's strange is I can create a new data source connection using that same V3 link (with the report name appended) and it seems to access it and load fine? So for now I'm going to try and figure out how to replace that existing data source connection. Thanks so much for your thoughts!