This question has the exact same title. This time however, it's specialler.
The previous question has had the user flag the same post under different reasons, but I've done it under the same reason "not an answer." Unless it's just me, and that I've misunderstood the answer to the other question.
What's happened? I don't think this is a bug. I have a feeling, it's actually quite legal.
Up until 4 weeks ago, it was indeed the case that you couldn't do this. Technically the flag in question was a "moderator message" (albeit with a pre-scripted text), and the logic used to be "has the user already added a moderator message for this post? (if so, reject)"; this was recently changed to "has the user got an open moderator message for this post? (if so, reject)" - presumably (I'll check) to allow some level of follow-up flagging. In your case, the first flag had been processed, hence why you could re-flag.
However, flagging with the exact same reason seems undesirable, even if it was processed. I have therefore added a check to reject duplicate flags. This retains the ability to flag the post for another reason / purpose.
