Unlike Egypt and China, why wasn't mummification practiced in ancient India?

Certain North-Eastern tribes did do so. I've read Manipuri records of such practices among certain hill tribes and even seen a few grainy pics from the early 20th Century of tribal chieftains maintaining resin-caked skulls of their ancestors. A form of mud-based mummification, as seen even now in remote regions of SE Asia, also existed.

No trace of all that now. Such remnants were destroyed, in some cases by missionaries after the locals converted and in the vast majority of cases, by the locals themselves. Infact some of the early “persecution” faced by Krischans was on account of their hatred for such ancestor worship. The Chin rebellions in Burma in the 60s saw massive destruction of Chin tombs by the now-Krischan Chin themselves. Similar vandalism was done by the Karen as well in the 70s.

Such events probably happened in India as well but have been covered up because we are a secular state and pagan history is anathema to our educated classes.