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That doesn't explain why I can, for instance, have a post disappear, post something different (and essentially contentless) and have it appear and remain, then post another thing meaningful and have it disappear, all at the same response depth. It also doesn't explain why, if I post something meaningless, then edit it to be something meaningful, the edit might cause it to disappear -- not to revert to its previous state, but to disappear -- and for things posted later at the same response depth to still be there.