Abyss rogue is reborn twice at each Ritual Altar

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Hi, I encountered what must be one of the rarest situations in the game: on a map without the affix "overrun by the Abyssal", i found Rogue and Ritual altar on the pit of Abyss. I knew I wouldn't see the second lichborn when ritual is started, but it felt strange to fight two identical rogues at the same time.