My friend and I came across this today randomly. Today he did a transfer on his pally and at the time had his concentration aura up.
After about an hour or so the transfer went through only to see that when he switched to another aura he still had concentration up along with any other aura.
We tested this to make sure it was not just a glitch and that both auras worked and they do.
We are going to do further testing with this today but as of right now he has not loged off, changed instance servers, or clicked on the concentration aura icon.