Same issue with 5.2.1 and 5.2 on macOS Catalina.
2016 MacBook Pro (non-touchbar) and Dell D6000 with USB-C to USB-A adapter attached to a powered hub.
The issue is fixed for me by uninstalling 5.2(.1) and reverting to 5.1.1
With the old 5.1.1 driver I have both screens available and working the same as it did in Mojave.
Tried lots of things with 5.2 and 5.2.1 to no avail.
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