I was browsing something out of curiousity and noticed that a diff wouldn't function the way you would expect it to.
The diff in question: https://en.wikipedia.org/w/index.php?title=User_talk:7%266%3Dthirteen&diff=prev&oldid=1142280354
Where the app takes me: https://en.wikipedia.org/w/index.php?title=User_talk%3A7&diff=1048278494&oldid=1047239704&variant=en
I don't really have any computer science background but I have found a lot of bugs that get reported to phab by others. Basically what I'm saying is I'm not sure what I'm doing. This is the first time I've tried to do file a phab ticket by myself. My best guess is that something about the username is causing the issue, like the symbols.