Looks like we're either using the wrong scene for world support queries or more likely query geometry is being added as static geometry in the NxScene and being picked up for world supports (this is more likely becuase we don't override the world support scene so it should just be using which ever scene is tied to the destructible scene).
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-23123 in the post.