moving a workplane origin

Hi, I have been using cadquery to produce swept solids. To position the 'end faces' of the solid at specified positions I have been using code similar to this:

`solid = cq.Workplane("XZ").moveTo(50, 0).workplane()`
`solid = solid.polyline([(-10, 10), (10, 10), (10, -10), (-10, -10)]).close()`

Previously, this would create a 20x20 square centered on (50, 0). However, this doesn't work anymore, the square now centers on (0, 0).

Could this be a bug, or maybe this is now the wrong approach to take?

My understanding was that `.moveTo(50, 0).workplane()` would essentially create a new origin at (50, 0) so that the polyline would be placed correctly.

I also notice that if .circle() is used instead of .polyline(), a circle is correctly centered at (50, 0).

Any help with this problem would be greatly appreciated.

Thanks,

John