VIEWPORT group 51 was not read, so a twisted viewport came back untwisted and a DXF or DWG
saved by CADCraft wrote it without its twist; AutoCAD then showed the sheet rotated. The twist
is now read (finite angles only, brought into one turn) and written when it isn't zero; the DWG
bridge already carries group 51 both ways. The display and plots don't apply it yet.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DRnJvmr59vS3DS5p2E8FhG