Dear friends!
I need your help!
I don't know where and how I made the mistake (or maybe it's some kind of bug or glitch) - but I have a problem.

There is an object, solid.
But for some reason it has two names: Corp_0000 and C_Corp.
And I just can't get rid of it.

When one name is hidden, part of the solid disappears.
The second name (Corp_0000, when I select it) - highlights the solid, but no transformations are possible with it (move or copy, etc.).
But if I delete this name, the solid is also deleted.

Help, I don't want to lose a responsible model.
The file with the scene is attached.

Any help would be welcome. Thanks!