With antora 3, the default branch behaviour changes a little and need some adaptations in scripts using antora site.yml. The default branch is now whatever is the default one on the remote repository, as opposed to "master".
Also time to reconsider change from 'master' to ... 'main'? (ok, just to be clear, that is no my critical "life and death" matter)
c72c4e5 solved this, I guess this can be closed.
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