I grew up in the Cariboo, where entire trees, with great, scarred bark like armour, riddled with peck holes and strewn about with cones flakes and needles, ooze sap. They took ages to get this far and they’ve just been getting older and older forever. And if the conditions are right, or wrong I guess, they will burst aflame along with their neighbours.
This is called “candling”. The term provides some measure of redress.