This is when executed on the cli. The problem is, there is no $_GET[idSite] set which means no Reports.addReports event listener can find reports as they use getRequestVar('idSite') to find eg all custom dimensions. This means it is not possible for plugins to add any reports depending on the idSite while rendering scheduled reports.

Easiest solution / work around would be probably to temporarily set an idsite while generating a report, and the ReportsCache would need to be based on idSite.

To test use eg ./console scheduled-tasks:run --force