I have noticed today (June 2023 version) that some measures, relationships and sort by columns are not being saved to the PBIT file. I have tried several times and ased a colleague to do the same an...
We see the same problem here. After saving / exporting as pbit in Power BI 2023.06, all measures and calculated columns are missing when the template is opened.
The problem appears to be on the write side, as Power BI 2023.06 can properly open pbit files exported with Power BI 2023.05. We came to this conclusion by examining older revisions of the affected pbit file. Each pbit revision was extracted as a zip archive and we took the version information from the CreatedFromRelease fields in the Metadata file. Files with "CreatedFromRelease": "2023.05" do not show any issues when opened in Power BI 2023.06.
Update: Reinstalling Power BI via Microsoft Store did not help.