Exact same for my case with iMac.
After upgrading to 10.15.1 (Cataline) from 10.14
(1) with the driver 5.2.1 bata3, "system preference" -> "display" -> "Arrangement" does not show the outer display
although "about this MAC" -> "System Report" -> "Hardware" -> "USB" shows the adapter.
(2) wirh the driver 5.1.1, "Arrangement" shows the display (Fine!), but the outer display says "NO SIGNAL"
Beta "3" is still NOT working.
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