Hitting the ground with a negative levitation effect (floating downwards) from at least 4 blocks up makes you take damage, and launches the player back up higher than where he jumped off.
Linked issues
Comments 4
@FVbico
negative effects aren't supported, nor should you be able to get them
He means the effect when floating downwards. (a.k.a level 128+)
Confirmed. This should be fixed for mapmapmakers
Here is a video: https://www.youtube.com/watch?v=Cg534NphYPM
that amplifier isn't supported eighter
MC-10755
negative effects aren't supported, nor should you be able to get them