Hey Nems,
I am having trouble with the lights updater as well. I am not able to update any new entities. The whole idea of updating is so that in a large level you make some changes you do not have to build the whole thing again(can take along time to do with large levels). I have used models that come with A7 itself or using the prefabs.
I am suprised that Conitec has not answered on this error or bug.