I was asking Claude yesterday about some specific roman history when it appeared to hallucinate a fact I knew not to be true - when I questioned it, it said it

I was asking Claude yesterday about some specific roman history when it appeared to hallucinate a fact I knew not to be true - when I questioned it, it said it sourced it from an Encyclopedia Brittanica page that was "flagged" as being an AI generated summary of their actual content, and admitted that the fact I challenged was not historically supported. So I guess we have entered the age of AI-generated "alternate facts" - one AI citing another AI's hallucinations as fact.