Only double switch if the dimension is the same. (#1977) According to the protocol, a double respawn packet is only needed to be sent if from the same dimension, so by storing the last known dimension, This also maintains the same behaviour for Spigot https://hub.spigotmc.org/stash/projects/SPIGOT/repos/craftbukkit/commits/ad2f806097e51fbf72f64ba97e2e4c3785326f42 (commit: 812141f)
