Screensaver broken in 10.14.2 Beta

In latest beta on Mojave (10.14.2) the screensaver does not work corectly on a double display Mac Pro. Instead of the selcted saver appearing on both screes, it shows on only screen two with screen one blank (not white, black or avaialbe colour just dirty white...).

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Out of curiosity was the screensaver working properly for you before this, on which beta an earlier 10.14.2, or 10.14.1? I'm seeing on-going screensaver hangs requiring a forced reboot that I'm trying to see if others are also having and I'm now at 18C38b and this has been a problem for me for the last few updates now.