On the 1.20.80 TNT does not work properly. In the 1.20.70 and older versions when there is 2 tnt in the same block moving or falling equaly, the first tnt to explode Will accelerate the momentun and speed of the tnt who did not explode. But in the 1.20.80 the first tnt to explode will completely stop the moviment of the tnt who did not explode.