The static mesh uasset files from any Megascans pack have no LODs when opened.
Here are 3 static meshes from the Megascans "goddess temple" pack (UE 4.25), for testing:
https://drive.google.com/file/d/1VLjCwKR2ZC3agzmtpclhtnEFEYHxxq3F/view?usp=sharingI tried debugging it and believe it is related to this todo here:
https://github.com/gildor2/UEViewer/blob/master/Unreal/UnrealMesh/UnMesh4.cpp#L2604Could not find online if there are any plans for this to be implemented, or if it's actually just a configuration error on my side.
Thanks for all your hard work!