If you can't validate that your bibliography is full of real articles, you shouldn't get published.
LLMs have just poured gasoline on the fire.
Let's say you read a paper on Arxiv but cite the version that was submitted to a journal or conference, without realizing that the authors made changes to the version they submitted and forgot to upload them to Arxiv.
References which don't accurately reflect the quoted material seem more common in other subjects.