I was tipple downvoted in ~20s before it disappeared so I noticed it very quickly because I keep an eye on pts to see if people have interreacted with something I've posted. I then scanned through the peer comments and noticed that a bunch of other comments had been very freshly flagged, within the ~40s of the last time I checked. These comments have been around for over an hour so the odds that there were all independently flagged so quickly at exactly the same time is highly improbable. And I couldn't see if my own comment had been flagged even though I could see others.
It's possibly a bug but I've seen similar behavior before and it was due to flagging but without the flagging flag appearing which happened later. I think it's a variation of hellbanned but for a single post. It was easy to notice because not only did the points go down just before disappearing they also stopped going up as it had done so reliably before being removed.
