Created attachment 80072 [details]
Document with 4 point polyline with equal start and end point

Open attached document. It contains a polyline with 4 points, where the start and end point is equal. But the objects gets closed.

When opening the file, the object has still 4 points in model, which can be seen, when examine it with a macro. But the status bar tells "Polygon 3 points" and it is filled. When saving the document with a new name, the object in the resulting, saved document has lost the draw:polyline element.