Because I would test if it's keeping its word, like periodically or spontaneously asking both whether it can _import_ the context from one chat to another or, judging the conversational flow between topics.
You’re attributing consistency and theory of mind to something that has neither. It will say yes sometimes, despite not being able to do so!
Maybe we're on different wavelengths on this issue but practically speaking, it hasn't spilled or splattered contexts from different chat topics.. yet.