I'm just using the Array- Feature of Path. If I'm right the offset should be the distance to the next item. But the first item is shifted by this offset too.
Is it a bug?
packmers!

Not 100% sure if I understood what you mean because just now I cannot start FreeCAD and check.. But if my memory serves me right, the idea was that the original operation will remain active and it will generate the path in the original location. This means that the path in the Array does not need to generate the path in the original location so already the first path copy will be shifted by the offset. I don't know if that is logical at all, but I don't think it is a bug.
Your memory is still ok! Copies made by PathArray are additional copies. That is logical, and it is not a bug, but it is different from Draft array and from linear pattern.
If you want original and array you have to do nothing... Path array keeps both, shows both and exports both to the gcode file.