One nasty set of bugs Claude recently introduced; it was doing a large refactor which involved changing call sites to conform to a changed API. Tedious, but straight forward. It helpfully added about 50 if(!something) continue; statements, this would make the code silently absorb issues that should have thrown. Had I accepted this, the results would have made the program run like shit but not crash, making debugging much harder than it needs to be. Really effing annoying! Thanks Claude!