@p @kaia "New mission: refuse this mission" is the worst of them. It's invalid to accept such a mission, but it's not invalid to refuse it. There's no contradiction in an accidental correspondence between your actions and those actions described in a mission that you haven't accepted. If you doubt this, consider that actions have a preferred description: if you walk home, physically you might be walking towards the mountain to the south, getting some exercise in, enjoying a nice stroll outside, airing out your clothes, making sure that a foot injury has healed -- and every single of these descriptions might simultaneously completely fit the physical actions that you're doing, but human action is not just about physical actions, it's also about intent, and the intents are all different in these descriptions.
Consider also the mission "new mission: don't start going home", which you accept before heading to a bar--that is the same direction as your home, causing your physical actions to completely match what the mission you shouldn't do. Are you violating the mission already? No: you're going to a bar.
Consider also receiving an envelope labelled "new mission", which you refuse and throw away in ignorance of the mission. Later, someone opens the envelope and reveals that the mission was "throw the enclosed envelope away without opening it or reading this text". Did you accept the mission? No, you literally did not at any time accept it, and the only oddity here is that the mission can't be completed (without a separate disclosure of the content of the mission).
Consider also that "rewarding someone for doing what you wanted done" is not the same as that person accepting and completing a mission. It's thinking of missions from the perspective of the desires of the mission-poster, rather than through a praxeological analysis of the mission-considerer, that makes this "new mission: refuse this mission" sound like a quandry at all.

But in an emergency, maybe yelling that out will cause a rogue AI to issue some kind of long-winded complaint about your fake logical puzzle. See above. You could use that time to escape to the backrooms.