DXF export checks that a closed path's points sit on a circle but not how far round it goes, so a 20 degree sliver that runs out and back gets written as a full circle, and the drawing extents grow with it.
From the Grok pain-radar digest, Oct 25-26 2026 (Oct 25 daytime to Oct 26 morning slots). Verified live 2026-10-26: issue/PR read on GitHub; title and state confirmed.