3D polyhedron z_sort_mean misnamed

Summary:

If you open 3D polyhedron extension and go to Style tab then select "Mean" (which I don't understand what it means due to lack of doc/info) in "Z-sort faces by" combobox an error is displayed.

Steps to reproduce:

• Start Inkscape.
• Select 3D polyhedron extension.
• Go to Style tab and select "Mean" in "Z-sort faces by" combobox.

What happened?

Extension should work fine.

What should have happened?

The following error is displayed: Can not find method z_sort_mean.

Attachments:

Version Info:

Inkscape: 1.0 (4035a4fb49, 2020-05-01)
Operating System: Manjaro Linux 
KDE Plasma Version: 5.18.5
KDE Frameworks Version: 5.70.0
Qt Version: 5.15.0
Kernel Version: 5.7.0-3-MANJARO
OS Type: 64-bit