We humans, as living organisms, should have some information in our memory. But that information should not be complete, it should be a store of repeated observations as an individual.
For example, if a mosquito is flying around at night while you are sleeping, you can choose to squash it or ignore it. Since the actual decision is not finished until tomorrow, you have uncertainty until tomorrow, a point in the future. But once you have crushed a mosquito, the world will probably split and you will move to the world where you have crushed it. In other words, you have memorized the information that you crushed the mosquito. And the world that you didn't smash it could exist as another branch.
The question is, what past paths are possible for the world where you crushed a mosquito? Because the information you have is incomplete, there are multiple possible paths. Looking at the above diagram, normal thinking would bring to mind the left diagram, but as a schizophrenic, I think of the right diagram. That is, there may be a point where the number of "possible past paths" is greater than 1.
It may be too complex and difficult to know exactly what the impact is, since individuals (or everything) is influenced by the environment and observations. However, given the biological significance of human memory and confirmation bias, it may be possible that choosing information that is convenient for you may result in choosing a world that works in your favor. If, from the level of the individual, there is the possibility of having a different past-path, what biological significance is there in synchronizing the information with other individuals? Isn't the information that humans have in their memory far more transposable than the fixed physical laws like speed of light?
These are just hypotheses, but what I'm trying to say is that uncertainty is a concept that can be applied to the past as well as the future. To demonstrate in a physical sense, of course, you need evidence.