Posted by DrAscii on Mar 01, 2020; 7:59am
URL: https://discuss.asciidoctor.org/How-to-delete-first-underscore-in-section-ID-tp7706p7710.html

In my case (HTML output only and non-English document language) setting the attribut

:idprefix:

 works very well. Thank you for your help!

Best regards
DrAscii