@Whatamidoing (WMF) I just had the tool insert a random <nowiki> onto a talk page, in a section far above the one I was replying to, which messed up the formatting of the whole page. The diff is at https://en.wikipedia.org/w/index.php?title=Wikipedia_talk:Manual_of_Style/Titles&diff=prev&oldid=1026131360, but for some reason, while the <nowiki> shows up in the source of the page and you can see its effect in the preview, the diff doesn't display that line as being changed.
