An update.
The reinstall of Logic's factory Sound Library cleared up the issue.
And, as cherry on top, I did not need to do anything to my Uber Patches that were there previously, as somehow, without any intervention, they are now working properly again too. As I make substantial use of those, it's a huge relief that I did not had to reinstall those.
So, there you have it: done, and done.
Thanks to everyone who chimed in.