Isn't it wonderful that, after all of these years, the pastebin "primitive" is still available and usable ...

One could have needed pastebin, used it, then spent a decade not needing it, then returned for an identical repeat use.

The longevity alone is of tremendous value.

Maybe it breaks some specific syntax required by the original system prompt? Though you'd think OpenAI would know to prevent this with their function calling API and all, so it might just be triggering some anti-abuse mechanism without going so far as to give a warning.