Player gains a farther jump when jumping from the edge of soul sand, as opposed to from the center of the block

Jumping from the center of soul sand makes the player jump only about 2 blocks, but jumping from the edge allows the player to jump 3 blocks.

In the video, it is shown that I can make a 3 block jump from the far edge of soul sand, but I cannot even make a 2 block jump if I make my jump while my hitbox is in the middle of the block, even though this jump is technically closer to me. I also feel slower while in mid air when trying the second jump.

https://youtu.be/7AOqChsvqQY

Expected result: Player should always have the reduced jump even when starting the jump off of the edge.