Visibility SM and SceneComponents in active player editor

Hello everyone. I have a problem. When i import the IFC file or another type file in pleyer with function FDatasmithImporterHelper.Import(), all geometries and materials was imported, DatasmithScene and other actors was created in outliner, but i can’t see this SM in my level editor.Visibility in outliner checked. If the imported DatasmithScene is dragged to the level from the content browser during the start of the game, it will not be visible, and if during normal editing of the level, then everything appears. What could be the problem?

AFAIK, datasmith scene are not meant to be dragged and drop while you play in editor.
Why do you want to add it after the game start and not before?