During a re-organisation of my patch library, which involved the creation of a few aliases (for what it's worth), Logic has stopped displaying all the folders when calling up the user library. Bug? Using Logic Pro X 10.5.1 + latest Mojave.
Notice the lack of "Keyboards" and "Synth". Nested within each of these missing folder is an alias as well.
Edit: Deleting all aliases resolves issue. A temporary workaround but it'd be useful to use aliases within the patch library.