Can't get any effect of 'Preferences > Input / Output > Print label comments'

Summary:

There's a preferences option for printing labels of objects in Preferences > Input / Output, and even two options in the preferences XML (add-label-comment and show-label-comment).

I've set them both to 1, but when I print to file, no labels appear (but they are set).

Steps to reproduce:

• open Inkscape

• Edit > Preferences > Input / Output > Add label comments to printing output : activate

• Add a label (and for fun, a title and description) to an object in the drawing

• File > Print > Print to file (pdf or ps)

• Additionally: open preferences file, and set the other label printing option to 1, then try again.

What happened?

No text comments printed

What should have happened?

Not sure. I suppose it would print some text where the labelled object is.

Version Info:

- Inkscape Version: 1.0.1 (16f50bf4c4, 2020-09-08)
- Operating System: Linux Mint 19.3