Foliage static lighting intermittently fails

Development Rendering
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5

On the other hand, when I run PIE it complains that there are 309 unbuilt objects, whereas there are 5 different types of foliage numbering around 1900 meshes, and all types of foliage seem to have the same problem (too bright/no static lighting) though that’s hard to verify at the moment.

DumpUnbuiltLightInteractions produces the following:

DumpUnbuiltLightIteractions
Lights with unbuilt interactions: 70
Light LightSource
Light fatGB-BP-exterior-floorlight_C_0
… (basically every static? light in-game)
Light fatGB-BP-exterior-floorlight13

Primitives with unbuilt interactions: 5
Primitive FoliageInstancedStaticMeshComponent /Game/StarterContent/Maps/UEDPIE_0_Minimal_Default.Minimal_Default:PersistentLevel.InstancedFoliageActor_0.FoliageInstancedStaticMeshComponent_0
Primitive FoliageInstancedStaticMeshComponent /Game/StarterContent/Maps/UEDPIE_0_Minimal_Default.Minimal_Default:PersistentLevel.InstancedFoliageActor_0.FoliageInstancedStaticMeshComponent_2
Primitive FoliageInstancedStaticMeshComponent /Game/StarterContent/Maps/UEDPIE_0_Minimal_Default.Minimal_Default:PersistentLevel.InstancedFoliageActor_0.FoliageInstancedStaticMeshComponent_8
Primitive FoliageInstancedStaticMeshComponent /Game/StarterContent/Maps/UEDPIE_0_Minimal_Default.Minimal_Default:PersistentLevel.InstancedFoliageActor_0.FoliageInstancedStaticMeshComponent_5
Primitive FoliageInstancedStaticMeshComponent /Game/StarterContent/Maps/UEDPIE_0_Minimal_Default.Minimal_Default:PersistentLevel.InstancedFoliageActor_0.FoliageInstancedStaticMeshComponent_1