I'm not sure if this is what julian (npub1uq5…z8a5) asks about, but this would be an example of what I meant in the post mentioned by Jenniferplusplus (npub1a5g…ax95):
https://federated.id/objects/2e6cf5a8-ffa8-4fca-b4cd-8e0c9a584a75/replies
You can see the list of replies fully (the public ones at least), and some of them have inReplyTo attributes that reference multiple objects. This is done to have a way to reconstitute the reply tree structure.
Mike Macgirvin 🖥️ (npub1k90…q43y)