Shifting is not possible on soulsand to reach the very edge of the block and still stay on it (it was before)

When trying to get to the very edge of soulsand, sneaking (shifting) doesn't stop you from falling off the block.
To reproduce:
1. Place soulsand.
2. Sneak to the edge of soulsand block you are standing on.
3. You will fall off the edge, not stay on the block