Just to add to this, we tried setting ‘Is Editor Only’ on the PCGVolume for both the PCGComponent/Cooking and Cooking settings. After then re-generating the PCG data in Editor, and re-cooking everything we don’t see any reduction in the PCG Meta data memory usage in game.
We’ve also spotted the ‘Is Editor Only Actor’ property, which applies to both the PCGVolume and PCGWorldActor - is this setting required on one or both assets to remove the runtime meta data without removing the scattered assets in game?