Maybe it’s different on other instances, but here on feddit a report gets “closed” as soon as someone resolves it. Doesn’t matter who did it. So if a comment on my community gets reported both I and the admin see that, and depending on who’s faster one of us can either delete the reported content or simply mark it as read. In both cases it’s no longer pending. The reports work like an inbox, so if I really wanted to I could double check resolved reports and delete them manually afterwards. Never saw the need to do that though. Im sure the other way around is possible as well.