I had the same problem with another dock (Vava?). I swapped it out for a Totu TT-DC002A connected with DisplayLink cables and it works well. I have a small issue with the screen contents swapping left for right in a 3 screen setup whenever it is plugged in, but otherwise it is a dream. I searched around a lot and know it takes the right dock to do the 2-3 screen extended desktop mode in MacOS.
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