I am seeing this in K8 and previous versions, plugin and standalone, MacOS. For K8, location of factory scripts AFAIK is /Library/Application Support/Native\ Instruments/Kontakt 8/Presets/Scripts. There are 9 directories there with scripts, but in KSP tab, preset→factory only shows "Harmonize", "Transform", and "Utilities". Furthermore, "Harmonize" shows 6 scripts, but the filesystem directory contains 8.
I also copied OrangeTreeSamples' "Pro Microtuning.nkp" into ${HOME}/Documents/Native Instruments/Kontakt 8/presets/Scripts/Tuning, expecting it to show up under preset→User, but User is greyed out (same if I move it up to the Scripts dir). I have restarted the computer just in case.
Am I looking in the wrong place, missing a step, whatever? Or is something broken?