In 20.70 dr3d:close-back and 20.71 dr3d:close-front:
Replace "plane" with "face".
Replace "will be generated" with "is generated"
Add the following sentence at the end of the first paragraph:
"It is only evaluated for geometries that are closed."
The ODF 1.0 errata changes of OFFICE-1823 for dr3d:close-back and dr3d:close-front have not been applied to ODF 1.2