Edit October 2020: This feature is now generally rolled out, so there is no way to go back to the old format any more. From what I’ve heard, the problems described in the article below don’t occur any more.
This is just a quick heads up for the new preview feature “Store datasets in enhanced metadata format“. You should definitely think twice before turning this feature on:
Background
With the march release came function “Store datasets in enhanced metadata format”. With this feature turned on, Power BI data models will be stored in the same format than Analysis Services Tabular models. This means that they inherit the same amazing options, that this open-platform connectivity enables.
Limitations and their consequences
But with the current setup, you could end up with a non-working file which you would have to build up from scratch for many parts. So make sure to fully read the documentation . Now!
In there you find this warning:
Warning for the new enhanced metadata format