Wrong cut list after deleting a body

Hi all (it's been a while)

I've got an issue with a cut list. Please see this .gif:

these are the steps : 

      1 - make a sheet metal with an hole (cut list is ok)

      2 - make a symmetry (cut list still ok) 

      3 - use the copy tool to make tow other bodies, and change the materal of the new bodies in the cut list (cut list still ok)

      4 - suppress the two first bodies, and the cut list is not good anymore (it will put item 3 and 4 in the same group despite not having the same geometry)

Weird thing is that is the delete body feature that break the cut list. 

We have found a workaround, if you change the material of a body, the cut list update well. But that's not very handy.

Any idea on how to fix that? 

Thanks.

SolidworksModeling And Assemblies