I also see stuff like this with Opus (4.8 and 5). It does the work correctly but then the explanation or "aftermath" description is kinda nonsense. It feels like they are tuned hard for agentic coding and everything else is getting worse. There are people that say older versions are also better for creative writing which would confirm this theory.

> they are tuned hard for agentic coding

Well you can't blame them, it's what brings in the cash. Other uses will suffer proportionally.