In discussions with LG, we have concluded the issue is a communication one, and only happens on specific PCs that for whatever reason have extra fast Com Port communication.
(Using a different PC, with slower coms speeds, for ColourSpace would work... or maybe even using a USB-2 port, rather than USB-3.)
We will need to add additional coms delay into the LG integration to slow-down the communication.
Additionally, the HLG option within the ColourSpace GUI is an LG experimental option, not presently available to end users.
It has been enabled on the LG monitor we have, and we were not aware it was not available to all.
Mob Boss at Light Illusion