@UnseelieDiabolus, the self-mummification process of the Shokushinbutsu (Living Buddhas) involve spending eight to ten years eating only pine needles, tree bark, resins, seeds, and small stones, after which they parch themselves to death. This is extremely different from the incorruptibility bestowed upon a number of Saints.
That said, the Catholic Church realized that there are many rational, non-miraculous, causes which can cause a body to be found incorrupt, such as soil type or climate. As a result of this, the Catholic Church no longer accepts incorruptibility as a sign of Sainthood.
And even more funny, because part of the rite of Excommunication in the Eastern Orthodox Church the statement, “May the Earth not receive your body.” And there are many cases where excommunicants of the Eastern Orthodox Church have been found incorrupt, but never an Eastern Orthodox Saint, they take it as evidence that they are the true Church and the incorruptibility of Catholic Saints is really the judgment of God, and not a blessing.