Datasmith not creating Datasmith scene actor

Hello,
Sometimes when I import via Datasmith, it doesnt create the Datasmith Scene actor for that particular import.
I do multiple datasmith exports from the same 3ds max file, and most times it works flawless and creates an actor, but sometimes it doesnt, cant find the actual reason and they are all simple geometries (no lights, cameras, etc).
In the outliner it does show that the imported geo are parented to a DS scene actor; can I create this manually inside unreal from this?
(Without it I dont know how to update the datasmith when I do edits in max.)

Any suggestions?

Edit: fixed it by collapsing the geometries, then restarting the UE scene file before import.