I'm having Soujourner's Sash in my bauble belt slot. Movement speed, jump height and walking over 1 block height works perfectly, but fall damage is not negated/prevented. I have a ring of mana with sufficient mana. If I jump from my roof, I loose 1 heart.

See this screenshot:

I'm running the pack hermitcraft 1.1.0 on minecraft 1.10.2.
The server creator added mods:

• ImmersiveEngineering-0.10-44
• Railcraft_1.10.2-10.0.0-beta2
• Waila-1.7.0-B3_1.9.4

Kind regards,
TvL2386

Fall damage is only reduced by the sash.