When exporting to DXF, even the latest versions create breaks between nodes. There is no rhyme or reason to where the breaks occur. This distorts curves. The breaks are very difficult to find.
Thanks for reporting this in the Ideas Portal!
With the new September 2023 Update the DXF export issue reported where there were breaks between nodes has been fixed. Now when exporting to DXF as splines, the curves will be continuous.
The update can be downloaded from the Patches & Updates page.