The current asciidoc.sh script is not using the system python binary by default, instead is will used the one present in PATH. So a user having a custom installed python version (in /usr/local/bin for example) will have the asciidoc package not working without updating his PATH environment variable
I’ve made a related merge request ion salsa but forgot to include it in the original report https://salsa.debian.org/debian/asciidoc/-/merge_requests/5