I participated a campaign battle in Jugner Forest with a friend. We was in unions, only 1 member in the union.

After the battle end we opened chest, got the spoils. We began kill monsters. A message "You or an alliance member is participating in a union. Ineligible to obtain treasure from the enemy." and the Allied Tag symbol reappeared instead the LS one. We had to teleport back to nation and come back for reset this problem.