It would require viewing the backwards flow of time I think. What if the particle doesnt just go through the slot individually but can go back time and make both possibilities individually. The reason we cant observe this is the forward flow of time. It could do both but we would only be able to observe one possibility because we can not track a backwards flow or change in timeline. We can only see the timeline to exist as it is. A metaphysical Schrödinger cat. It both is and isn’t.
@elonmusk When observed it eliminates possibilities. Possibly like gravity it can exist in more than one place at a time and leak. When observed it locks it into one possibility not many.