I twice got the error alert box when saving. However, it turns out that it did save both times. The first time, it did the intended edit (https://en.wikipedia.org/w/index.php?title=Participants_in_World_War_II&diff=562174851&oldid=561500927). The second time, it did a dirty diff for a pipe character (| -> <nowiki>|</nowiki>) in a section of the page I didn't edit.
Version: unspecified
Severity: normal