I throw objects, let's say about 6 stacks of apples and 32 stacks of steaks, set fire to a lighter and stop the fire, the objects are visually burned, but when I go near them, 2 stacks of apples are picked up and let's say 32 steaks, some of the objects are burned, and some remain.  Perhaps this is due to the fact that objects do not burn out immediately, but even if you leave the fire for a long time, objects will still not be burned.