What the bug is:

When using sneak on the edge of powdered snow to descend quicker fall damage is taken despite being in powdered snow. I originally found this but it was marked irrelevant due to mods so I used the default 1.18 in the launcher and removed all texture packs.

Expected behavior:

No fall damage is to be taken due to powdered snow's fall damage negation.

Steps to recreate:

Step 1:  Build a tower of powder snow alternating with air. (Total height does not matter but you need the tower to be at least 5 blocks tall) 

Step 2:  Stand on the very edge so that if powder snow was placed where your head is your vision would not be obscured.

Step3:  Hold shift and you will take fall damage every other powdered snow block you land on.

For the images, I attached I made sure to not move the player from the coordinates on the f3 screen and made sure to have hunger missing to not regen health during descent. (Sorry for the particles I forgot to hide them)