mat@friendica.exon.name you're right, and in the ideal case, NodeBB would not send summary either, as it is automatically generated.
Right now, we are in a situation where Mastodon will utilize summary for non-note objects, but ignore content. This is why we send both, currently.
When Mastodon updates their implementation to consume preview, then we will update ours to no longer send summary.
cc darius@friend.camp