A new thermal vent spewing steam in the air at Yellowstone ... The volcano’s magma chamber between 5 and 10 miles (8 and 16 kilometers) under the surface heats the underground water that bubbles ...

at least one other Galaxy Note 20 Ultra does have the copper heatpipe and vapor chamber cooling, as you can see in this teardown video. We are not sure why some phones have graphite thermal pads ...