Done Direwolf20 node 2 Boots of the Meteor ground pound not working

So, I have been playing on node 2 of the Direwolf20 server, and I've made boots of the meteor. In addition to allowing the wearer to launch themselves in the direction they are looking by shift-jumping (which works), the wearer is also supposed to be able to do a ground pound by pressing shift in midair. This will immediately halt the wearer's upward momentum, and start them shooting down faster than a normal fall. Upon impact with the ground, there will be a small explosion that does damage in an AOE of around 2 blocks, and strength and range is dependent on how far above the ground the pound was initiated. This explosion does not damage blocks. I was hoping to be able to use the ability to halt upwards momentum to be able to control my insanely high jumps, but I have discovered that the ground pound feature does not work on the server. I have tested in single player, and it does. I could understand the AOE explosion being disallowed if it was a method of pvp bypass, but I fail to see why the pound can't be initiated at all.