I added a single letter ("therafter" --> "thereafter"). VisualEditor duplicated the categories and the default sort.
Version: unspecified
Severity: major
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=50385
https://bugzilla.wikimedia.org/show_bug.cgi?id=50332
https://bugzilla.wikimedia.org/show_bug.cgi?id=54169