Observe the page shown by this URL: https://en.wikipedia.org/w/index.php?limit=50&title=Special%3AContributions&contribs=user&target=Dbachmann&namespace=&tagfilter=&start=2016-03-10&end=2016-03-11
While I can click "older 50" to see their older contributions, there is no link for "newer 50" even though this user has many newer contributions.