yea not really a solution as there doesnt seem to be one they way HLOD works as it seems it needs to be build at very last before you cook and probably you need to rebuild it every time if you change something, so i just stoped using them / building them till the map is done and will only look at them once im “finished” for lets say an alpha build. In addition because of you just “build” it will take forever i suggest you use only HLOD Volumes you place yourself and you mod what assets go into those, it doesnt make a lot of sense to put a rainpipe and an AC unit into an HLOD for a large building as the player would not be able to see them anyhow from that distance so just slap meshes in that are car sized or trash container sized and stuff like that.