I have the same problem, have been using the UR242 on a MacBook Pro (13-inch, 2016, Four Thunderbolt 3 Ports) for more than 3 years, lately running Garageband 10.3.5 over MacOS Catalina 10.15.4. The Steinberg input/output options just disappear from the System Preferences and System information once Garageband is loaded. I realized this is an old issue but I started to experience just on 9/20/2020. Could you please respond with a fix?
Thanks,