If I conquer a territory I was engaged in trade with, I will continue to get a notification saying my resources are being poached due to supply issues. None of the trade routes will be marked as hostile or blocked. Looking at the resource itself in inventory, it will say +4 from Player and then -4 from Supply Issues. Obviously the number of acquired resource hasn't changed since I am now the owner of the supply, but I continue to get a poached notification every turn and the resource icon stays red. Misleading but not negatively impacting gameplay.