This reminds me of the story in Where Physics Meets Experience

Yu'el nods. "I can even see some of the troubles myself. Suppose you split brains only a short distance apart from each other, so that they could, in principle, be fused back together again? What if there was an Ebborian with a brain thick enough to be split into a million parts, and the parts could then re-unite? Even if it's not biologically possible, we could do it with a computer-based mind, someday. Now, suppose you split me into 500,000 brains who woke up in green rooms, and 3 much thicker brains who woke up in red rooms. I would surely anticipate seeing the green room. But most of me who see the green room will see nearly the same thing - different in tiny details, perhaps, enough to differentiate our experience, but such details are soon forgotten. So now suppose that my 500,000 green selves are reunited into one Ebborian, and my 3 red selves are reunited into one Ebborian. Have I just sent nearly all of my "subjective probability" into the green future self, even though it is now only one of two? With only a little more work, you can see how a temporary expenditure of computing power, or a nicely refined brain-splitter and a dose of anesthesia, would let you have a high subjective probability of winning any lottery. At least any lottery that involved splitting you into pieces."

De'da furrows his eyes. "So have you not just proved your own theory to be nonsense?"

"I'm not sure," says Yu'el. "At this point, I'm not even sure the conclusion is wrong."