I think, due its importance, that this has been reported (searched but found nothing).
Special:Wantedpages show many links to pages "requested" via expresions like "{{#ifexist:}}". Query the existence of a page doesn't make it "wanted", sometimes its the exact opposite; we use this expression for filtering pages we DON'T WANT.
This affects the experience of editors that uses Special:Wantedpages to find articles or pages to work, and finds this special page full of noise.