It isn't something I worry about at all. If it doesn't work and starts creating bugs and horrible code, the best places will adjust to that and it won't be used or will be used more judiciously.
I'll still review code like I always do and prevent bad code from making it into our repo. I don't see why it's my problem to worry about. Why is it yours?
Functional bugs in edge cases are annoying enough, and I seem to run into these regularly as a user, but there's yet another class of people creating edge cases for their own purposes. The nonchalant "if it doesn't work"... I don't know whether that confirms my suspicion that not all developers are aware of (as a first step; let alone control for) the risks
Edge cases will usually be the ones to get through. Most developers don’t correctly write tests that exercise the limits of each input (or indeed have time to both unit test every function that way, and integration test to be sure the bigger stories are correctly working). Nothing about ai assist changes any of this.
(If anybody starts doing significant fully unsupervised “ai” coding they would likely pay the price in extreme instability so I’m assuming here that humans still basically read/skim PRs the same as they always have)