This typically happens when you run the chat too long. When it gives you a new codebase, fire up a new chat so the old stuff doesn't poison the context window.

But it rarely gives me a totally-new codebase unless I'm working on a very small project -- so I have to choose between ditching its understanding of some parts (e.g. "don't introduce this bug here, please") and avoiding confusion with others.

Why isn’t it smart enough to recognize new contexts that aren’t related to old ones?