MULTILEADERS are missing when converting R2007 DWG files

[xbdr419]

Hello, after I read a DWG file and save it directly, the dimension elements are lost. Here is the code. I hope to get some optimization. My current version is 1.1.4b2. 感谢。

from ezdxf.addons import odafc
doc = odafc.readfile(r'.\testt\demo.dwg')
odafc.export_dwg(doc, 'demo.dwg', version='R2007', replace=True)

source file:

save file:

dwg file:

demo.zip