Unexpected reference tokens appearing in assistant output

They are citation references. However they are being written wrong. Where the AI needed to have written a (recycle/refresh) unicode code point to finish the single citation, the AI instead produced a repeat of the (outline star) unicode code point.

You are a consumer of OpenAI’s poor vector store product, internal prompt language, and choice of characters the AI won’t produce reliably, and using AI that won’t believe that you have the rights to tell it how to use tools in a “developer” message to improve the situation.