[smcnally]

That is definitely an issue with many LLMs. I've had limited success including instructions like "Don't invent facts" in the system prompt and more success saying "that was not correct. Please answer again and check to ensure your code works before giving it to me" within the context of chats. More success still comes from requesting second opinions from a different model -- e.g. asking Claude's opinion of Qwen's solution.

To the other point, not admitting to gaps in knowledge or experience is also something that people do all the time. "I copied & pasted that from the top answer in Stack Overflow so it must be correct!" is a direct analog.