The FBX importer in object builder does not import explicit vertex normals. This feature is extremely important since object builder's own normal calculation is very weird and breaks all normal maps.

the .OBJ importer DOES import explicit vertex normals correctly, so the feature is obviously supported.

The .FBX importer is superior to the .obj importer in every other way, so i'd rather be using that, but not being able to import vertex normals makes it totally unusable