Alembic Caches Not Working With Lumen

It appears that Alembic caches do not influence Lumen's indirect lighting (except for shadowing).

Alembic geometry caches should influence lighting in Lumen as any other geometry in a level.

I have attached an example project and video that illustrates the issue.  In the video there are two Cornell Boxes.   The balls in the left box are coming from alembic caches.  The balls on the right are animated in UE in sequencer for comparision.

Feel free to contact me with any questions.

1. Import an alembic geometry cache into any existing Lumen based scene
2. View the scene through the Lumen Visualizer to see the influence of the alembic cache geometry on the Lumen lighting.

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