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InstancedFoliageActor_0 Static Mesh actor has NULL StaticMesh property

A rebuild always generates this warning twice:
InstancedFoliageActor_0 Static Mesh actor has NULL StaticMesh property

After long investigations I finally decided to delete all foliage. The warning is still there with no foliage left.

Any ideas?

Am I really the only one who ever ran into that problem?

Yep. It must be due to some custom coding you are doing for something else that affects foliage?

Also, potentially you compromised the foliage actor. Deleting all foliage does not delete the actor. Delete the actor and try adding new foliage in, see if it persists.