I have this same issue a lot.

I vibe up a lot of really simple casual games, which should have very minimal demands, and the LLM-agent introduces bad things a lot that don't present right away. Either it takes multiple bad things to notice, or it doesn't really affect anything on a dev machine but is horrible on wasm+mobile builds, or I just don't notice right away.

This is all really hard to track down, there's noise in the heuristics, and I don't know if I'm looking for one really dumb thing or a bunch of small things that have happened over time.