Yes, it only appears in "reduced transparency" mode, but that's no excuse. Again, this is a well reported bug that many people have noticed 6 months ago and it would take an Apple intern 20 minutes (maybe an hour if they were very inapt) to locate and fix the issue. It's just not a priority to them. I really wish that they would switch to a 2 year OS release cycle, and work harder on stability of the core OS. They can pull Messenger, Mail, Facetime, and all the other apps out of the OS package, and add features to those all they want, but I want the core OS to be stable.