The reason for it is likely the way level sync is coded to make sure no one can go in with buffs already active. Even though tank stance only gives enmity generation (now anyway), it is still considered a buff and therefore part of this coding that makes it get turned off. Considering this affects all buffs, I do not think SE is going to go out of there way to make it so it doesn't affect tank stance.


Yes its annoying and yes it sucks when you get sync'd down and forget to turn it back on but that unfortunately is just how its coded so we don't have issues with buff bugs going in to lower level content