This is why at every software project I've done in the past 15 odd years, steps were taken to prevent this in an automated and standardized fashion; code reviews of course, but they're more for functionality. Unit test requirements, integration / end-to-end tests based on acceptance criteria, visual regression tests, linting, type systems, OTAP, CI/CD, audit log via Git and standardized commit messages, etc etc etc.

My job hasn't significantly changed with AI, as AI generated code still has to pass all the hurdles I've set up while setting up this project.