Researchers from Rice and Stanford refer to this recursive data contamination as Model Autophagy Disorder (MAD), analogous to mad cow disease. (Reminder: do not eat the neural tissue of your own species.)
https://therepublicjournal.com/essays/the-curse-of-the-ai-ouroboros/
https://therepublicjournal.com/essays/the-curse-of-the-ai-ouroboros/