In the mobile diff, a click on the user name usually leads to their mobile user page, where one finds a link to their contributions. For users without a user page (aka red link), however, the mobile website launches into the editor instead of displaying the user page. Going back a step in the browser returns to the diff.
As far as I can see, for these user accounts there is no way to reach the user contributions by clicking a link. Instead, one has to manually go to the Special:Contributions URL.
== Replication instructions
* Visit https://en.m.wikipedia.beta.wmflabs.org/wiki/Special:MobileDiff/349080
* Click user name
* Click contributions
Actual: User cannot navigate to contributions
= Acceptance criteria
{F22358231}
[] The user on a diff page should link to the user page in view mode NOT edit mode
e.g. https://en.m.wikipedia.beta.wmflabs.org/w/index.php?title=User:Mr_Selenium