If you use the f warp every so often ( about 1 in 3 times) you will fall through the block the warp is and into the next layer. This can cause you to die when using f warps especially if your warp is in the end or in a sky base. This needs to be fixed asap and i can show any admin online that it happens if they need me to. Today i lost a hero full hero set of armor and some other supplies but most annoyingly i lost my guardian spawner i attached a video below i took showing me falling through the void which would be impossible without this glitch . Tl;dr F warp can cause you to fall through blocks needs to be fixed and lost good stuff which would like to be returned