You're saying it as if the poor author just had no choice but to let LLM write their bibliography. To avoid hallucinations, maybe just don't let an LLM write any part of your paper?

You can only get in this situation if you let a bullshit generator write your paper, and the fraud is that you are generating bullshit and calling it a paper. No buts. It's impossible to trigger this accidentally, or without reckless disregard for the truth.