The Bug:
The motion of primed TNT is choppy and jittery.
Steps to Reproduce:
Place down a TNT block high above the ground.
Ignite it and watch it closely as it falls.
Observed Behavior:
The motion of primed TNT is choppy and jittery.
Expected Behavior:
The motion of primed TNT would not be choppy and jittery.
Can confirm.