In https://meta.discourse.org/t/editing-wiki-posts-at-same-time-as-someone-else/30741/10 I’ve got a mini onebox and an ordinary onebox, both pointing to different parts of the same topic. After posting I changed the title of the topic, so I rebuilt did a “Rebuild HTML” to fix the titles in the oneboxes.
The regular onebox got fixed, but the mini onebox remains the same.