I am very glad I could help 
I made the citation callout to see where I’ve cited the current piece of literature in my own writing, not to see backlinks to literature note itself. This is because you can see those backlinks in the backlinks panel.
I also use the Strange New Worlds plugin, which adds a very convenient backlink counter and viewer.
I am not entirely sure I understand the issue you raise, but it seems to stem from different expectations and different naming of the notes. In my case, my literature notes have the citekey as the file name, including the @. So I would link to a literature note like so [[@the_citekey]].