This is cute - but it's a frequent error that you see under high load. Try to copy your prompt and reload the page. It's typical answer would be to thank yopu for pointing out its error. It's actually fun to find it can learn _within_ a conversation.
🙂
@boris_steipe it was pretty hilarious really, this was after I had pointed out five or six times specific logical errors in its argument, and when I resent the prompt it just kept repeating the mistake. Worst student ever!