Yesterday, while trying to debug my own code, I came across a Stack Overflow answer which contains a factual error. I suggested an edit to the answer. Because I don't have enough reputation, the edit had to be peer reviewed.
My suggested edit was rejected.
The answer does contain a factual error which, like I commented in my edit, is poorly documented even in the original documentation. This was a great source of trouble for me (cost me more than an hour trying to figure out what was wrong) because the answer does not mention a very important "exception behavior" of the suggested code usage.
Nonetheless, my edit was rejected with the message:
"This edit is incorrect or an attempt to reply to or comment on the existing post."
When is it suitable to edit an answer?