If you run down from a high platform while pressing the jump button in the air and press the sneak button about 2-3 blocks before the ground, you will not get any fall damage.
The platform I was on in the video was 29 blocks high
Here is the video: https://youtu.be/NJFBlNKsdQg
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migrated
Invalid, modded game.
Not related to sneaking, it's spawn invulnerability. Duplicate of MC-49727.