Running into the same thing if anyone sees a fix. Using the free Hillside Sample package and getting this in 5.2-
“Unable to load package ‘/Game/Megascans/3D_Plants/NativeViolet/T_NativeViolet_BC_02’. The end of package tag is not valid. Check that the file is of the expected type and not corrupted.”
The asset is present, but not working while just about everything else imported perfectly.