Windows 10 64bits, Latest Java, Minecraft Server 15w31a
I used the /effect command on my server to give myself the new levitation effect.
Looks like the player is kicked for floating too long...
Steps to reproduce :
1. Launch a Minecraft server
2. Give yourself the levitation effect (/effect <name> minecraft:levitation)
3. Wait a few seconds
1. The kick message received for floating for too long
2. What it looks like from the command prompt window