Preview Feature in Desktop for RS Oct 2020 enabled by default

Hi Michael_Mertens  and josef78 ,

I am sorry about the issues you have been facing and understand the frustration this might be causing. We are aware of two issues related to enhanced metadata:

- Servernames/Database names with mismatch casing in the same report causes failures during refresh: There is a workaround available to use the same casing in the report.

- Queries using Table.NestedJoin expression fails to refresh. No known current workaround (other than disabling the option of enhanced metadata). 

We currently are unaware of any other issues, if you are experiencing any problems that do not seem related to the above we would be interested in getting a repro report. The best channel for that would be to contact Microsoft support so you have the right contact to get updates and proper resolution, if you have a repro handy (e.g. a pbit file which would have no data) i'd appreciate if you could share so feel free to reach out with a private message.

Addressing your other point I just wanted to clarify that Power Bi Report Server does not support preview features. The fact that enhanced metadata is in the preview pane is mislabeling. This feature was generaly available as part of the september release of Power Bi Desktop (service), and subsequently in Power Bi Desktop (ReportServer) in october. Therefore you should expect the same support as any other production feature.

To your question on future releases. Enhanced metadata is the new format used by PBI Desktop going forward (it can't be disabled in the service version of desktop for example). The option to fallback to the previous format will be removed in a future release of Pbi Desktop for Report Server, at that point all reports will be saved only in the new format, the release where this will happen is still being determined but there is no plans to change the behavior to be disabled by default.

Thanks

-gboreki