According to the math it does, but no one is getting how profound this is. Apparently, the quantum field knows of future decoherence events. Or coherent waves don't have a future time limit on becoming physical. Coherent waves are everywhere, including the future.
A wave packet is as physical as light can become. A matter wave is forced to use spacetime when a decoherent event is imminent. Wave packets use spacetime so there is a chance the particle is not truly physical until the decoherence event. The particle had to be a wave packet first because wave collapse wasn't an option yet. Do I dare say the decoherence event is wave collapse? Because the collapsed wave is allowed to continue past the event, it was allowed to dictate what the particle was in flight (decoherent).