But .. that's not the AI's fault. If people submit any PRs (including AI-generated or AI-assisted) without completely understanding them, I'd treat is as serious breach of professional conduct and (gently, for first-timers) stress that this is not acceptable.
As someone hitting the "Create PR" (or equivalent) button, you accept responsibility for the code in question. If you submit slop, it's 100% on you, not on any tool used.