I discovered this while troubleshooting an application's system requirements.
When I go into the advanced application launcher Information (F2 + more), the Filter colum shows that all applications are "Filtered (Hidden):"

Of course this is not the case, most apps show up, but there is definitely something wrong in that the colums reads this way, and apps that really are hidden due to a filter, do not give me any descriptive reason, it just reads the same "Filtered (Hidden):"

Has anyone seen this before?