As the title suggests, this log message is not particularly helpful for models containing more than one object.
The message:
Getting the name of the object with invalid normals/bitangents would be much more helpful!
Example: "[Scene 3D] [FBX] : Mesh(car_window) normals are invalid (some values are null) and will be recomputed"
The current workaround to address this is to re-import my model in chunks until I identify the problematic mesh that needs fixing. This process is an unnecessary complication, especially when Substance already identifies the mesh causing the issue.