Get xfile subset with mesh editor

vvvv beta question
1

Hi
given an xfile with a number of subsets, if you do a getslice(Node) to get only one of them and send it over to a shader for drawing all is good but if you get the same slice and separate the vertices and recompose them back, then all subset appears, this is weird.
S.

2

wow 2007

and more recently but no answer

3

just uv map and prepass with layout on uv

4

I ve found out that the xfile plugin in blender has a nice option to eport only selected objects which resolves my issue, still I think it is a weird behavior, isn t it?
S.