XD I do not know. It can't be that the wrangler actually mistook it for the/a book, since the tag follows the standard formatting for theatre tags, not book tags. I haven't complained to Support about it, largely because it's such a hilarious and relatively harmless example of AO3's incompetence that I can't really be bothered. Though I suppose it does affect findability for any new play fans, so perhaps it is worth doing!