Trouble with Arc Dimensions and unknown attribute 'defpoint2'

[ChaseCrossley]

I am relatively new to DXF files and ezdxf, so please forgive my ignorance if this has been addressed before. I looked on various platforms to see if someone had a similar issue with Arc Dimensions, but I could not find anything related to the issue I was experiencing, so I assumed it was a very niche case.

I was having trouble saving a document with an Arc Dimension present within the DXF file. I have attached a testing file with which I was having issues.

I was receiving this error

.../ezdxf/entities/dxfns.py", line 344, in _export_dxf_attribute_optional
    raise const.DXFAttributeError(
ezdxf.lldxf.const.DXFAttributeError: Invalid DXF attribute "defpoint2" for entity ARC_DIMENSION

from the following code block

import ezdxf
doc = ezdxf.readzip('arc-dim.dxf.zip')
doc.saveas('test.dxf')

After investigating that a debugger with the specific entity causing the error, I realized there was no attribute called defpoint2 present within the entity. I looked under DXFATTRIBS.

I believe I am missing a critical piece of information to understanding what is happening. Thank you for any help!

testing file: arc-dim.dxf.zip

[mozman]

Created issue #506