This reply tool diff looks really bad: https://en.wikipedia.org/w/index.php?diff=1019597647&oldid=1019597422
But this is misleading. The actual changes made in that edit can be seen in this diff: https://en.wikipedia.org/w/index.php?diff=1019597647&oldid=1019596517
The diff, and the page history, are all messed up because the history of two pages was merged into one:
The original diff is actually a comparison of two completely different pages.