Posted by TheMagician on Oct 10, 2019; 11:57pm
URL: https://discuss.asciidoctor.org/Small-Issues-with-Font-Awesome-Inline-Icons-SOLVED-tp7211p7216.html

That explains it. Thank you!

Perhaps the third paragraph of chapter 45 of the manual could be changed to:

Alternatively, you can have Asciidoctor “draw” icons using the Font Awesome 4.7 font-based icon set.