Complete beginner here, just trying to learn basics. When I build lights I end with the LIGHTNING NEEDS TO BE REBUILT (1 unbuild object) error message. LightingTroubleshootingGuide suggests using DumpUnbuiltLightInteractions command to find out which actor is a source of problems. When I do, I get

Lights with unbuilt interactions: 1
Light LightSource
Primitives with unbuilt interactions: 1
Primitive FoliageInstancedStaticMeshComponent /Game/Level1/NewMap.NewMap:PersistentLevel.InstancedFoliageActor_0.FoliageInstancedStaticMeshComponent_7
It is clear that it is some part of the foliage that is a source of problems, but I have literally hundreds of trees/bushes/grass. I can't find any way of locating what is the FoliageInstancedStaticMeshComponent_7 - am I missing somethign obvious?

(edit: not sure if that's the right subforum, couldn't find of a better one)