Part 3/9:
At the core of the misunderstanding is the interpretation of quantum mechanics. The retrocausal interpretation assumes a classical viewpoint, where particles are seen as either waves or particles at the moment they leave their source. Thus, when a measurement determines the nature of an entity—wave or particle—some interpret it as having retroactively affected its state at the point of creation.
However, this interpretation flounders under a standard quantum mechanics perspective, where particles exist in a superposition of states. A photon remains in a wave-like state until it is measured, and only when its path is determined does it collapse into a localized particle, resulting in different observable outcomes.