Still an issue in Mojave?
 

I thought I read somewhere that with Airplay was no longer being used with 5.X driver in Mojave as it provides a new/better interface. However, I'm still having the same issue with Apple Watch login with DisplayLink monitor connected. Is the 5.X driver still using something under the hood that Apple interprets as screen sharing?

Other than this, DisplayLInk has been working fairly well for me...Macbook Air 2015 with one Thunderbolt display and one DisplayLink display.