When reviewing edit suggestions, I often use the custom reject reason. This allows me to give the editor some personalized guidance, so that in their next edit they can do better.
For some reason, this custom reject reason is called "causes harm". I'm not sure why it is given this name, and not something more neutral like "other". Maybe it is an attempt to discourage reviewers from using it, but at least on Stack Overflow the problem is with people who approve too easily, rejecting does not need to be discouraged there.
In fact, I can't think of a way in which an edit causes harm that is not already covered by "spam or vandalism" or "clearly conflicts with the author's intent".
So let's call the custom reject reason "Other".