Manager can generates non unique application id in menu
When creating a new application in menu from Manager, the application id is computed from application name.
If this application has the same name than an application in another category, then it will get the same id, which is possible as applications are sorted by categories in the application hash. But if you change the dislay rule of the first application, the second application will also be impacted, as they have the same id, and this id is removed from applications shown in the portal.
I am not sure on how to fix this...