Steps to recreate:

• Create a cliff like structure with a wall directly next to it.
• Hug wall and start walking (a little bit diagonally, so you still hug the wall).
• You should start to fall a lot slower than usually.

facts:

• it works in creative & in survival.
• jumping and then hugging the wall doesn't work
• you must hug the wall or else it won't work

Link to a video

https://old.reddit.com/r/Minecraft/comments/ak4d6h/19w04b_falling_off_a_cliff_or_ledge_while_hugging/