Нашёл официальное пояснение In both cases (Alchemist who gains the Marionette ability or Marionette who thinks they're the Alchemist) the only resolution I can see is to just treat them as a poisoned/drunk Alchemist and tell them the wrong ability and not have it affect anyone. In both cases the Demon would learn who the Marionette is and would be their neighbour. If it's an Alchemist with the Marionette ability, the Demon would immediately know this as they wouldn't have been shown them as a Minion during Demon info.

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