[REGRESSION] Export has missing entities, randomly.

Reported by users on the forum (https://forums.unrealengine.com/unreal-engine/unreal-studio/1548249-unreal-studio-beta-4-21-release)

 

I can reproduce locally with sample scene from Revit.

 

Regression from the hierarchy and materials refactor that happened recently.

Open a relatively large scene in Revit, like the "Advanced Sample" or larger:

 

G:\Team Drives\Enterprise Product\Engineering\QA\scene files\Datasmith_Revit\production_scenes\Legendre_VR

Export a 3d view

During export, click in the revit UI.  This should abort the export process (unexpected).  You will end up with reasults like this:

 

(note the missing entities)

 

[Image Removed]

 

 

 subsequent exports seems to be ok but some objects are missing as well (notice the roof):

[Image Removed]