Are psychedelic ego death experiences comparable to genuine Buddhist realizations of non-self?

Psychedelic substances such as psilocybin or LSD often induce experiences described as "ego death," where the usual sense of self dissolves and a feeling of unity or boundlessness arises. Some interpret these states as glimpses of spiritual truth, potentially similar to Buddhist insights into anattā (non-self) or śūnyatā (emptiness). From a Buddhist perspective, are these chemically induced experiences considered valid insights into the nature of self and reality, or are they fundamentally different from the realizations attained through traditional Buddhist practice? Are there teachings or commentaries that address the nature or value of such experiences?