Not recoding the URL (pointing to the database index entry) in the citation doesn't seem to be what Peter is talking about. No URLs in citations has been happening for a month or so.
The best I can gather is that you have a timeline event (Fact) with a link to a citation (1 Source Citation). Is that correct? Then when you click on the "1 Source Citation" and then the link to the source nothing happens. Is that correct? But when looking at the Facts & Sources and then the Source Citations page the citation is there and clicking on View Record works?