When posting from Mastodon with a content-warning, I would expect a new topic in a federated category on Discourse that reflects the content-warning in its title.
For example, https://lire.im/@admin often posts Mastodon updates information under the content-warning "Mise à jour à la version $version_tag". But the corresponding topic title matches part of the first sentence of the post itself, ignoring the content-warning.
@mastodon is the content-warning not part of the post itself? Sorry I didn't look into it, but I would expect a specific field that @angus should integrate as part of the title generation for Discourse topics created from the Fediverse.
Thanks!