I can only give our exp.
I installed new 5.1.1 fresh on 10.14.5 and nothing - black screens. Extension authorisation blinked for a moment but I couldn't grant it no matter what (just OK that it is not allowed). Multiple reinstaleations ad visits in SysPref -> Sec&Priv settings didn't helped either. So I am left with mouse and keyboard working on DL.
Friend made progressive update to 10.14.5 on 5.1.1 that was working before and everything is still working as before.
I basically gave up and prefer to use now whiff and cable to one display instead on cable to rule them all.. (2 screens, network, mouse and keyboard).
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