I have experienced that many of the questions I am most interested in are closed as "Not Constructive", seemingly to fulfill some artistic vision of the moderators and how they would like to "architect" the community. Very frustrating.
I also had a situation where I found a bug in some Python code on an accepted SO answer, submitted an edit, and had my fix repeatedly rejected by moderators. I tracked down one of the moderators' email and asked him about it, found out that he does not know Python and that he rejected my edit because it was already an accepted answer so why should I edit it? ...? In the end, after I persuaded him that my fix was helpful by getting other developers to testify that the existing code was broken and the fix fixed it...he posted my edit as his own and took credit for it.
I also had a situation where I found a bug in some Python code on an accepted SO answer, submitted an edit, and had my fix repeatedly rejected by moderators. I tracked down one of the moderators' email and asked him about it, found out that he does not know Python and that he rejected my edit because it was already an accepted answer so why should I edit it? ...? In the end, after I persuaded him that my fix was helpful by getting other developers to testify that the existing code was broken and the fix fixed it...he posted my edit as his own and took credit for it.