Joined a valiant little tailor adv when there was very little time left.
Sent 5 generals to the final castle from the start of the island. Before the attack started there was ~22 min left.
After 2 of them had attacked, there was 5 min left according to the timer.
-> UI pop up came saying 'this adv has expired'.
Is this intentional behavior? And no, the host of the adv was not online so he could not be there to cancel it.