We think that the loss of causality in tunneling experiments in another, even more direct justification for the occurence of synchronicity ; Imagine a conscious observer A, who agrees with his friend B that both of them should wear always the same hat in the future.
Then, this observer travels(with his hat) as‘tunneling particle, with superluminal velocity through a huge tunnel barrier.
By special relativity, he must become younger during this journey.
Thus, the end of the journey(from the viewpoint of the external observer B) would appear for him as its beginning.
Now, B walks around the barrier and meets A(as physicists do in their experiments), who is completely astonished to see that B wears the same hat as himself. This might appear to him as a“synchronicity”.