If I understand correctly how the linked questions works; if the post Q1 contains a link to Q2 (anywhere on the page - in the comments, in the answers, in the question) then Q1 is shown among linked questions for Q1 and vice-versa.
When there are too many linked questions, a there is a link saying "see more linked questions", for example [here](see more linked questions).
After clicking on that link you get search of this form:
But this only returns questions linking to the given question and the ones which are linked from it.
For example, if I would click on this link for Q1, I would not see Q2.
Is this intentional? Or is it a bug?