When I move down the list of categories, Application Launcher is not showing the entries from the "Power / Session" Category, it continues showing the "Utilities" (the previous entry) instead. When starting at the bottom "Power / Session" the entries will show correctly but "Utilities" will continue showing them. In all other categories the correct entries are shown, no matter what, only two neighbouring categories are affected though installing or removing an application changes what categories will be affected, seemingly at random (It was "Multimedia" and "Internet" before that.)
This was fixed recently. The fix will be included in the next 5.12.x and the 5.13 release. *** This bug has been marked as a duplicate of bug 394013 ***