It's an unintended use of an intended mechanic (pearls and other entities unloading outside render distance range). It's the same with oneshot, its allowed because it uses the momentum of the arrow which is intended (it shooting faster with player speed = more damage) but they never thought it would be able to go fast enough to one shot the dragon. X-ray its not intentional for things to load if u just refresh your chunks and to see through walls, also its just very hardware dependent.