I got this issue after upgrading to Catalina (10.15.5) on an older macbook pro (15 inch, early 2013), i'm telling you this because on new macbook pro (16 inch, 2019) there's no issue at all!!!
After one month or more of trial and test, yesterday i think i found a workaround. (i still hope for un update of the driver)
The point is to use UX2 only for the input and use the mac headphone plug for the output.
1) In System Preferences/Sound, I set up as Output the Headphone Port and as Input Toneport UX2
2) In Logic in Preferences/Audio, set the input and Output Devices as "System Settings", so that it can take the settings given in System Preferences
(I think you can setup any other DAW/audio software like this)
hope it works!
p