alt Hacker NewsAI also quickly goes off the rails, even the Opus 2.6 I am testing today. The proposed code is very much rubbish, but it passes the tests. It wouldn't pass skilled human review. Worst thing is that if you let it, it will just grow tech debt on top of tech debt.
The code itself does not matter. If the tests pass, and the tests are good, then who cares? AI will be maintaining the code.