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It's the old HN shuffle: Flag controversial thread off the front page, mark unflagged as dupe of flagged/aged thread that can no longer surface.

In this case it's the "old HN shuffle" of not having off-topic stories, as I explained here:

I didn't mean to ascribe intent. I wrote more earlier in a reply attempt, but it was blocked ("you're posting too much" karma penalty message).

Does it result in the error for you too? Maybe it's related to that, otherwise it's really suspicious.