The article https://da.wikipedia.org/wiki/Henrik,_Prinsgemalen has a large number of sections, so it shows a table of contents. That works fine, except one of the headings includes a ref, and the entire ref is shown in the TOC. Is that on purpose? Is it a new thing? Can it be changed? Could the note perhaps even be invisible in the TOC?

Where can I read more about this?

Regards, Ole