Ah, and yes, this for real.

Just now I had a bug where a 90 degree image rotation in a crate I wrote was implemented wrong.

I told Claude to find & fix and it found the broken function but then went on to fix all of its call sites (inserting two atomic operations there, i.e. the opposite of DRY). Instead of fixing the root cause, the wrong function.

And yes, that would not have happened a few months ago.

This was on Opus 4.6 with effort high on a pretty fresh context. Go figure.