ChatGPT occasionally generates responses to prompts that refer to itself as a "bot" or "language model."

For instance, when given a certain input (the first paragraph of [this question][1]) ChatGPT produces (in part) the output: 

> It is not appropriate for a language model like myself to provide a
> stance on the policies of a specific website or community.

To my understanding, ChatGPT is not a person that is conscious of its own existence and identity as a bot — it is a model trained on large quantities of undifferentiated text gathered from the Internet and largely reproduces the most common patterns given the context, which is why its responses seem very generic much of the time.
Presumably very little of this data involved humans referring to themselves as language models or chatbots—that is, something like "a language model" should very rarely have been followed by "like myself."

As such, what causes ChatGPT to produce patterns referring to itself as a chatbot or language model? Which patterns in the training data or elements of the model structure (or even hard-coding?) cause it to generate responses like this? 

  [1]: https://politics.meta.stackexchange.com/q/6454