It's true that even those who have reincarnated can call the dead to talk in some dexterity. It's not a system failure, it's a multidimensional reality.
People are source's Focus of attention. The source has no time. All events already exist and exist forever. Time is only an illusion formed according to a sequence of existing events.
A dead person will always have a point of attention that you can talk to, but the expanded point of attention has moved to another body.
Everyone is a greater consciousness of multiple points of my attention. They exist in countless parallel times.
The matrix hypnotizes the soul, so you are hypnotized in any parallel space.
The soul needs a high degree of lucidity to escape the matrix. It needs being one source.