I'm literally looking at Claude in the other window telling me that the bug we're working on is a "Clear-cut case", telling me to remove a "raise if this is called on this object" guard from a method, because "the data is frozen at that point" and is effectively proposing a solution that both completely misses the point (we should be calling a different method that's safe) AND potentially mutates the frozen data.

We're 41k tokens in, we have an .md file that describes the situation and Claude has just edited the .md file with a couple of lines describing the purpose of the guards.

I don't understand, are other people working with a different Opus 4.6 than I am?