One thing that oddly sticks in my mind from an old 1950s nursing text that I read a long time ago had to do with Muslim burial custom. They like em planted within a day of death.
I still think there’s shenanigans, but I’m fairly sure that custom is the one being referred to. Not sure if burial at sea is considered equivalent. No real desire to look very much into Islam crap to find out, either...sorry.
Custom also requires that they be 'prepared and planted' by their family.