Clicking on text (not a link) in Preview used to move the cursor to the corresponding line in Code View. It's not a feature I really used, so I probably wouldn't have noticed its disappearance on my own.
Glancing at the
commit to add the link-following ability suggests to me that the disappearance of the GoToPreviewLocationRequest() signal is causing this. It's no longer being emitted during Preview's mouseReleaseEvent. So effectively, when it's not a link that's being clicked in Preview, nothing is happening.