Imagine there's a question.
And there is an answer - a correct one, getting upvotes.
OP edits his question, because he forgot to specify a detail which now renders the answer incorrect. OP also points out his edit in the answer's comments.
There is a second answer. A correct one, accepted, didn't get a single upvote.
In the end, there's a question with a correct and accepted answer, and an incorrect, but upvoted one. Everything seems fine, I am just curious about what to do now? Is it ok to downvote the previously correct answer? Should I edit it (after some time, ofc) to point out that it is no longer true so it won't confuse anyone? Should I leave it to its own life?