I noticed that if I detach the callout because maybe I want to reposition it better and by mistakenly attaching it again I hook the nearby piece, the number doesn't change. Can anyone else confirm this error?
If it can be useful, selecting a piece with the ctrl key pressed, the piece is displayed in the tree.
This only works if you have an assembly of only parts and with a maximum number of pieces occupying the program window because you don't go directly to the selected piece, but you will have to scroll through the tree.