When the player falls at cobwebs and berry bushes, the game plays the fall damage sound but the player doesn't get any damage, it only occurs at certain heights:
Applies on 20, 23, 25, 28, 30, 32, ... , blocks above when inside the cobweb / bush.
How to reproduce
Put a cobweb or berry bush below you and be sure you're on survival.
/tp ~ ~20 ~
❌ Fall damage sound plays.
/tp ~ ~21 ~
✔ Fall damage sound doesn't play.
Can confirm.