Agents write code fast but somehow they can't debug what they wrote

It's a strange trade i've noticed. The agents are genuinely good, I use them all day. But every time I hand one an actual bug it doesn't debug it, it rewrites the thing. We had an importer dropping about 2% of rows on a timezone edge and I gave it to Claude maybe 5-6 times over two days. Three different rewrites, all clean, none of them fixed it. In the end I read the code myself and it was a date getting parsed twice, once as local and once as UTC. Twenty minutes. so my conclusion that the code gets written faster and the bugs stay where they are. Our open bug count went from around 40 in March to 130 now and it isn't that people got lazier, it's that fixing something means understanding it first and fewer people do. We run coderabbit / bugbot on prs which catches plenty going in, but neither of them knows why a thing was shaped the way it was six months ago, and that's usually the question. It might be just me. Mostly what I see is more code shipped and the same list of complaints sitting there