I am running the Jan 2019 build of Power BI Report Server. For paginated (SSRS) reports, I am UNABLE to change a report to use a different shared data source on the portal. I click "Manage" on the report, then "Data Sources". I then click the ellipsis next to "a shared data source", and select the data source I want to switch to. I then click "Save", and the button disables as if it saved the change, but if I leave the page and go back in, it shows the old data source.
However, if I open the report in Report Builder, and point the new shared data source there, then re-deploy to the server, it keeps that new connection.
This certainly seems like a bug to me. Can anyone else confirm the same behavior or let me know what I'm missing?