In a paper published in 2012, Brukner shattered this assumption. He proposed that the temporal sequence of two events, just like the positions of a particle or the path it took, could also exist in superposition. That would mean that the arrow of time could have abrupt kinks in its trajectory.

https://www.newscientist.com/article/mg24532650-700-in-the-quantum-realm-cause-doesnt-necessarily-come-before-effect/