Is it possible to remove/detach objects from others (in the same group) if they disappear in Edit Mode?

Question

Blender

A strange problem arose, I'm sitting like this trying to make my "masterpiece" in Edit Mode, and now I'm happy to finish everything and switch to Object Mode, and there are some extra objects that disappear as soon as I switch to Edit Mode, and in In other modes, they are easily visible and work!
But I can’t delete them, because they are in a group with the objects I need!
Question: "Is it possible to remove/detach these objects from others?"
If so, can you tell me where they come from?
Google did not give an answer, or maybe I asked it incorrectly :)
Blender 2.80
Screenshots are attached!

Answer 1

Objects can be hidden not only in object mode, but also in edit mode, which you did (only these are not objects, but a part of the mesh, simply not connected by polygons to the rest of the parts). Objects hidden in edit mode become visible again in object mode.
Solution - ALT-H in edit mode. Next - delete these meshes or detach from this mesh.