Without looking at the exact data exchange in it's entirety, I can't say for certain. I'm not even sure if the trigger I suggested is really what is happening.
But you can see the parts I'm referring to in this anonymous sample of what it looks like when an Article(Thread) is federated out. In this example, there is no value for inReplyTo, but that would have the link to just the individual content, not the magazine. You'll see the "actor" and "attributedTo" is a user account, not the magazine.
{ "@context": [ "https://www.w3.org/ns/activitystreams", "https://w3id.org/security/v1", { "ostatus": "http://ostatus.org#", "sensitive": "as:sensitive", "votersCount": "toot:votersCount" } ], "id": "https://kbindomain/m/testmagazine/t/16", "type": "Create", "actor": "https://kbindomain/u/demouser", "published": "2023-06-17T18:58:26+00:00", "to": [ "https://kbindomain/m/testmagazine", "https://www.w3.org/ns/activitystreams#Public" ], "cc": [ "https://kbindomain/u/demouser/followers" ], "object": { "id": "https://kbindomain/m/testmagazine/t/1676", "type": "Page", "attributedTo": "https://kbindomain/u/demouser", "inReplyTo": null, "to": [ "https://kbindomain/m/testmagazine", "https://www.w3.org/ns/activitystreams#Public" ], "cc": [ "https://kbindomain/u/demouser/followers" ], "name": "Federation Test", "content": "<p>Test for the body of the article</p>n", "summary": "Test for the body of the article #testmagazine", "mediaType": "text/html", "url": "https://kbindomain/m/testmagazine/t/1676", "tag": [ { "type": "Hashtag", "href": "https://kbindomain/tag/testmagazine", "tag": "#testmagazine" } ], "commentsEnabled": true, "sensitive": false, "stickied": false, "published": "2023-06-17T18:58:26+00:00", "contentMap": { "en": "<p>Test for the body of the article</p>n" } }s }