If my sub reports are hidden in the app, the users receive an error that the report is unreachable. Why is this experience different for PBIX reports with hidden tabs? Please fix this bug.
We use the same technique with paginated reports, and have the same issue. This was a fairly common technique used with SSRS reports, and used to work the same way with paginated reports.
We need to be able to differentiate 'visible on navigation' from 'accessible to run'. We don't want the user to be able to run the sub-reports from the navigation menu - the reports are not meant for that, they are only meant to be accessed via the link generated within the main report (which includes appropriate parameter values).