When AI writes your code and something breaks in production, who owns the bug?

We had a production bug last week traced back to a function that was almost entirely AI-generated. Nobody on the team wrote it — someone prompted it, reviewed it quickly, and merged it. It looked fine. It wasn't. So now the question is — who owns it? The dev who prompted it? The one who approved the PR? The tool itself? Does it even matter as long as it gets fixed? Starting to think we need a whole new definition of "code ownership" for AI-assisted teams. Or at least an honest conversation about what "reviewed" actually means when the code wasn't written by a human. How's your team handling accountability for AI-generated code?