Hello
Probly its working as intended, but its way to exploit.
If youre server is like myne, there will be not many people playing at Wintergrasp, so once it stats, you que and wolaa you will be ported to northend, and from there is short way to dalaran (to trade inscs or watever). You can use the portal hole time when the Wintergrasp in progress
Regards
P.S
Not sure someone has posted it, but it anyways