Answer:
The problem lies in the original plan that was created in Gaus-Krüger coordinates, i.e., the elements in the drawing have a very large offset from the origin point, resulting in rounding problems.
Solution:
Copy the relevant parts of the drawing into a new .dwg near the origin (0,0,0).
![](/web/image/508094/2021-09-02_17h47_59.png?access_token=5f7882bd-ff1c-40af-a377-39120b27b6a6)
![](/web/image/508096/2021-09-02_17h51_27.png?access_token=f1be4d83-3d60-4c09-9c73-fe5f9c60620d)