Alternate realities: a quantum mechanical version

I have published various arguments in favor of the existence of alternate realities. (Trans. Kansas Acad. Sci., vol. 121, 2018, pg 211 for example.) Proietti, et al, now claim to have performed a Wigner's friend experiment in which "two observers can experience fundamentally different realities." arXiv:1902.05080v1, 13 Feb. 2019