Reimporting fbx scene with colliding mesh names breaks other levels

I have 2 levels - main level and now I created second level. Both levels are created completely in Blender and are quite complex (several hundreds of objects). Of course all objects are named “Plane.001, Plane.002, Plane.003, Cube.001” and so on. In both levels.

When I import fbx into level (File → Import into Level) it works properly at first. But when I try to reimport fbx file (I’m importing into blueprint object to make hierarchy reimportable), objects on main level with colliding names get replaced as well trashing whole scene.

Is there a way to apply some prefixes to objects names during import to avoid such behavior? Or limit reimport scope?