I did a test with Grok recently - asking it to find quotation. It gave me one & claimed it came from a famous author. I checked it. The author never said that. I asked Grok to find the real source of the quotation. Grok attributed the quote to another author. I checked it. It was false. I did this 3 times and each time Grok gave a false attribution for its fake quotation.
Run this test for yourself.
If students & journalist use chatbots to find quotations, we're going to end up with mass false attribution & slop contamination in all our texts.