I've added various fields to my menu. Some text, some links, some paragraphs. Save and clear cache. The menu items show up, but none of the added fields.
Add fields. Clear Cache. Refresh page, no added fields.
I've tried switching themes to use Core themes. I've turned on the Demos module and the Body and Term fields it uses, show up. But no new fields I add are rendered.
Postponed
2.11
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Installed in a fresh D10.1 site, I do not see the added fields in Olivero but switching to Stark and they render. Looking deeper, Stark uses menu--extras.html.twig but Olivero is choosing menu--primary-menu.html.twig which I'm sure is a theme template taking priority over a module template.