Does Gemini 3 retain conversational context less reliably than Gemini 2.5?

I could be mistaken, but Gemini 3.1 Pro seems less consistent than 2.5 Pro at adhering to instructions established earlier in the conversation.

For example, if I explicitly ask it not to include summaries or next steps in its outputs, it initially complies but eventually reverts to including them, as if the instruction has fallen out of scope.