UVEditor missed pieces

Hello, I’ve been trying to unwrap the geometry which consist of 30+ items - heavy and small polysurfaces, but had to take a pause cause the uv layout manual process took all day. The next day I opened my file and noticed that my heaviest items (150-200 surfs per item) doesn’t show up when I tell the UVEditor to show up. Nevertheless the meshed UV pieces are still there cause the texture is projected and displayed the right way, even the exported .obj files opens well inside Blender3D and its UV tool displays all the islands without any missing ones.
So I still have ~10% of UV islands to pack into layout and now Rhino lost my main parts and makes me to start all over again. Is there any kind of solution could be? Thanks in advance.