I was messing around with jump boost in singleplayer, and I discovered that higher levels of jump boost stop fall damage. I fell off a 25-block tall pillar, and upon landing, I took 6 hearts, as is usual. Then, I gave myself jump boost twelve, and did the same thing. I took no damage at all. However, when sprinting in the air, I took damage after falling 24 blocks. I do not think this is not intentional, due to the inconsistency of the damage.

I believe this is due to the fact that at higher velocities, it can get to a point where you teleport incredibly quickly, multiple times per second, allowing you to go through collision boxes, which causes another bug I discovered: (you can ignore it if you'd like)

About sliding down a honey block onto a slime block, which normally results in the honey slowing you down, and you not bouncing, but at certain velocities, you bounce off the slime block without ever colliding with the honey block