Resolution: Won't Fix
Minecraft 18w45a, Minecraft 19w04b
When the center of the player is not above scaffolding, they are not experiencing its ladder effect: Smoothly going up and down.
Instead they jump up one scaffolding block at a time and fall down multiple scaffolding blocks when going down.
This is related to MC-1133, but possibly not a duplicate, because some functionality (that you can go up and down) works as expected.
- Build a tower of scaffolding
- Move partially inside it, but make sure that your center is not inside it
- Move upwards by pressing the jump key
→ You jump up one block at a time instead of going upwards smoothly
- Move downwards by pressing the sneak key
→ You fall downwards