In journal publications it is, but without DOIs it's difficult.

In conference publications, it's less common.

Conference publications (like NEURips) is treated as announcement of results, not verified.

Nobody in ML or AI is verifying all your references. Reviewers will point out if you miss a super related work, but that's it. This is especially true with the recent (last two decades?) inflation in citation counts. You regularly have papers with 50+ references for all kinds of claims and random semirelated work. The citation culture is really uninspiring.