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.
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@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

well... I think that should be considered a feature. It allows cool things
That bug is resolved anyway
negative effects aren't supported, nor should you be able to get them