https://hub.spigotmc.org/stash/projects/SPIGOT/repos/craftbukkit/commits/5863a2eaefe37920cbfa7dbd04f35f0cb2555cfa#src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java?f=698

This line is incorrect, should be

Preconditions.checkArgument(lines.length <= 4, "lines (%s) must be 4 or less", lines.length); 

As now it can only work with 3 lines being passed and not all 4