Why duplicate static mesh when undo(Ctrl + Z)??

Hey guys…
I made actor that has two child actors.
If I move an object from position 1 to position 2 and then undo(Ctrl + Z), the object that cannot be clicked or deleted continues to appear in the editor, but rendering.
스크린샷 2023-08-29 160655
I check when undo is performed, the constructor corresponding to the child actor is called.
Why do this? How can prevent this situation??

Hi, I have the same problem. Have you found solution for this?