Exploring Quantum Mpemba Effects
physics.aps.org
physics.aps.org
Just a thought, if the effect is simply an statistical/emergent phenomenon like temperature then the many parameters involved, initial conditions, bulk amount, physical setup etc. might be the reason why repeatability is inconsistent. Perhaps there have not been enough rigorous studies.
Also, one wonders about the accuracy of reports such as this when errors of this magnitude get through the editing process (the date of ref [1] is 1969):
[1]. The phenomenon has sparked intense debates for more than two millennia and continues to do so [millennia?]