Possible offset2D bug

In this scenario I am trying to transfer an offset wire from a cylinder to a box. Performing a 2D offset I would expect that the dimensions of the wire will change but that it will remain on the same plane as the original wire. This is not the case as the offset2D operation changes the z component of the wire by 10 points (as much as the dimension of the box). The seems to be that the location of the wire does not match the CenterOfBoundBox. I am currently correcting it using `center-offset.CenterofBoundBox()` but it feels more of a hack than the intended behaviour. Shouldn't the location of a wire and its center be at least coplanar?

``` python
from cadquery import *
from cadquery.selectors import *
from math import *

from dataclasses import dataclass

box = Workplane('XY').box(10,10,10, centered=(True,True,False))
cylinder = box.faces('>Z').workplane(offset = 1).cylinder(10,5, centered=(True, True, False), combine=False)

center = box.faces('>Z').val().CenterOfBoundBox()

wire = cylinder.wires('Z').add(wire_loc).toPending().cutBlind(-1)
```