Objects with centered pivots become Actors instead of StaticMeshActors when imported via Datasmith

When selecting "affect pivot only" and choosing "center pivot" on 56 objects in 3DS Max 2019, 4 of them imported into Datasmith as Actors and not StaticMeshActors. This makes it seemingly impossible to edit the Actor's materials in the level.

This was reported and tested in 4.21 (4.21E2) and reproduced in 4.20 (4.20E4). 

1. Download the attached file
2. Open the UE4 Editor and create a blank Unreal Studio project
3. Click on the Import DataSmith button
4. Import the .udatasmith file

Results: Objects with centered pivots become Actors instead of StaticMeshActors

Expected: Objects with centered pivots become StaticMeshActors