WORLDGUARD-3370 - Reported by jerethkhan

Players (since WG5 and into WG6) are able to set a region teleport flag with a Y coordinate of any number. This results in issues like falling forever if the number is set to 1 million or triggering cheat plugins to temp ban over and over. Could there maybe be a check added to the teleport x,y,z flag to ensure Y is not set above 256?