@pfefferle ah that's too bad - looks like Mastodon's problematic implementation here has leaked to other servers as well.
Found an interesting FEP [1] referenced in an existing open Mastodon issue [2] - essentially adding proper objects (Notes) or Links into the actor attachments, but keeping those schema PropertyValue items around for backcompat until everyone upgrades.
Would you consider implementing this FEP for the WP plugin?
[1] https://codeberg.org/fediverse/fep/src/branch/main/fep/fb2a/fep-fb2a.md