What is the scientific and religious explanation for the excretion of feces from a deceased person shortly after their death?

The discharge of some waste from the deceased after the soul has departed is not uncommon. Jurists have mentioned the desirability of gently pressing the stomach of the deceased before shrouding, for fear that something might be discharged after shrouding. And whoever witnesses this should conceal it and not inform anyone; because the sanctity of a Muslim deceased is like their sanctity when alive, and in the Hadith: "No servant conceals another servant in this world except that Allah will conceal him on the Day of Resurrection."