After adding a dashboard to the ACI Reporting menu item, it does not show but other dashboards seem to have replicated. Below is an example of what is seen:
Known to exist at least within 25.4.2 and 25.4.3
Known defect
If this happens, the recourse is to re-edit the menu and remove the added dashboard. This will remove the replicated dashboard entry.
Note: Some users may need to log out and then back in before the changes are seen.