EntityFallingBlock wont fall/spawn

So I'm trying to spawn a EntityFallingSand, but when I spawn it, it shows me for 1 milisec and then it instant despawns, so I have no idea why

if(nbt.getString("EntityID") != ""){
						if(!world.isRemote){
							WorldServer serverWorld = (WorldServer) world;
							entity = serverWorld.getEntityFromUuid(UUID.fromString(nbt.getString("EntityID")));
							if(entity != null){
								if(entity instanceof EntityNotFallingBlock){
									EntityFallingBlock efb = new EntityFallingBlock(world, (double)entity.posX + 0.5D, (double)entity.posY, (double)entity.posZ + 0.5D, ((EntityNotFallingBlock) entity).theBlock);
									efb.getEntityData().setInteger("Time", 1);
									world.spawnEntityInWorld(efb);
								}
								entity.setDead();
								stack.setTagCompound(new NBTTagCompound());
							}
						}
					}