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There is no physical eternity, so there is a small probability of fork in each moment. Therefore, there will be eventually next observer moment, sufficiently different to be recognised as different. In internal experience, it will be almost immediately.
This doesn't follow. It seems very likely to me that it can allow it to change it ways it doesn't adapt to the pain, both from first principles and from observations.
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That would be like having multiple different Everett branches experiencing suffering (parallel lives), which is different from 1 long continuous life.