Sketch not visible or not there

Hello,

I've tried the sketch-example
```
result = (
cq.Sketch()
.arc((0,0),1.,0.,360.)
.arc((1,1.5),0.5,0.,360.)
.segment((0.,2),(-1,3.))
.hull()
)
```
with several different cq-editor-packages (windows). Installation from artifacts like described.
But in no one (release version, development version from today (22.01.2023) or 1 month ago) a sketch is shown.
3d examplas work fine.

Do I have to change something in preferences for 2D/sketch-visibility?

Thanks for Feedback
Markus