I know that frontier models (Astra, Fable, Opus 5.5) at some point always end up writing a test that unnecessarily elongates CI. I've seen everything from literal sleep calls in a test unit to arbitrarily deciding a test needs to download a 100MB file to prove something works. As a engineer, I catch these, but a vibe coder has no idea there's probably hundreds of these in their code making CI take 10-20 minutes. Hell, they probably don't even click the "Actions" tab.
What a mess.